diff --git a/katrain/__main__.py b/katrain/__main__.py
index 502859e..b8ecd36 100644
--- a/katrain/__main__.py
+++ b/katrain/__main__.py
@@ -207,7 +207,7 @@ class KaTrainGui(Screen, KaTrainBase):
                 and not (teaching_undo and cn.auto_undo is None)
             ):  # cn mismatch stops this if undo fired. avoid message loop here or fires repeatedly.
                 self._do_ai_move(cn)
-                Clock.schedule_once(self.board_gui.play_stone_sound, 0)
+                Clock.schedule_once(self.board_gui.play_stone_sound, 0.25)
         if len(self.engine.queries) == 0 and self.idle_analysis:
             self("analyze-extra", "extra", continuous=True)
         Clock.schedule_once(lambda _dt: self.update_gui(cn, redraw_board=redraw_board), -1)  # trigger?
@@ -324,7 +324,7 @@ class KaTrainGui(Screen, KaTrainBase):
         self.controls.timer.paused = True
         if not self.timer_settings_popup:
             self.timer_settings_popup = I18NPopup(
-                title_key="timer settings", size=[dp(350), dp(400)], content=ConfigTimerPopup(self)
+                title_key="timer settings", size=[dp(600), dp(500)], content=ConfigTimerPopup(self)
             ).__self__
             self.timer_settings_popup.content.popup = self.timer_settings_popup
         self.timer_settings_popup.open()
diff --git a/katrain/config.json b/katrain/config.json
index a8e5203..d3980d4 100644
--- a/katrain/config.json
+++ b/katrain/config.json
@@ -22,6 +22,8 @@
     "timer": {
         "byo_length": 30,
         "byo_periods": 5,
+        "minimal_use": 0,
+        "main_time": 0,
         "sound": true
     },
     "game": {
diff --git a/katrain/core/engine.py b/katrain/core/engine.py
index a975924..8fb0319 100644
--- a/katrain/core/engine.py
+++ b/katrain/core/engine.py
@@ -85,7 +85,7 @@ class KataGoEngine:
     def start(self):
         try:
             self.katrain.log(f"Starting KataGo with {self.command}", OUTPUT_DEBUG)
-            startupinfo = None # stop command box popups on windows/pyinstaller
+            startupinfo = None  # stop command box popups on windows/pyinstaller
             if hasattr(subprocess, "STARTUPINFO"):
                 startupinfo = subprocess.STARTUPINFO()
                 startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
diff --git a/katrain/core/game.py b/katrain/core/game.py
index ee4077d..3a3261f 100644
--- a/katrain/core/game.py
+++ b/katrain/core/game.py
@@ -79,6 +79,7 @@ class Game:
             self.root.set_property("RU", katrain.config("game/rules"))
 
         self.set_current_node(self.root)
+        self.main_time_used = 0
         threading.Thread(
             target=lambda: self.analyze_all_nodes(-1_000_000, analyze_fast=analyze_fast), daemon=True
         ).start()  # return faster, but bypass Kivy Clock
diff --git a/katrain/gui.kv b/katrain/gui.kv
index 07219f9..7d8825e 100644
--- a/katrain/gui.kv
+++ b/katrain/gui.kv
@@ -357,14 +357,14 @@
     spacing: CP_SPACING
     padding: CP_PADDING * 4, CP_PADDING * 2
     paused: True
-    timeout: self.state[1] <= 0
+    timeout: root.state[1] is not None and root.state[1] <= 0
     MDBoxLayout:
         size_hint: 0.7,1
         MDFloatLayout:
             size_hint: 0.4,1
             TimerLabel:
                 color: BACKGROUND_COLOR
-                text: '8:88'
+                text: '{}:88'.format('188' if root.state[0] >= 6000 else ('88' if root.state[0] >= 600 else '8'))
                 font_size: 0.85*self.height
                 pos_hint: {'right':1,'center_y':0.5}
                 halign: 'right'
@@ -379,20 +379,20 @@
                 valign: 'middle'
         TimerLabel:
             size_hint: 0.05,1
-            text: "x"
+            text: "x" if  root.state[1] is not None else ""
             font_size: self.height * 0.3
             text_size: self.width, self.height * 0.95
             halign: 'right'
             valign: 'top'
             timeout: root.timeout
         TimerLabel:
-            size_hint: 0.1,1
+            size_hint: 0.075,1
             font_size: self.height * 0.35
             text_size: self.size
             halign: 'left'
             valign: 'top'
             id: periods
-            text: str(root.state[1])
+            text: str(root.state[1]) if root.state[1] is not None else ""
             max_lines: 1
             timeout: root.timeout
     MDBoxLayout:
diff --git a/katrain/gui/badukpan.py b/katrain/gui/badukpan.py
index 611e706..18ba0e0 100644
--- a/katrain/gui/badukpan.py
+++ b/katrain/gui/badukpan.py
@@ -106,8 +106,21 @@ class BadukPanWidget(Widget):
             return
         katrain = self.katrain
         if self.ghost_stone and ("button" not in touch.profile or touch.button == "left"):
-            katrain("play", self.ghost_stone)
-            self.play_stone_sound()
+            current_node = self.katrain and self.katrain.game and self.katrain.game.current_node
+            if (
+                current_node
+                and not current_node.children
+                and not self.katrain.next_player_info.ai
+                and not self.katrain.controls.timer.paused
+                and self.katrain.play_analyze_mode == MODE_PLAY
+                and current_node.time_used < self.katrain.config("timer/minimal_use", 0)
+            ):
+                self.katrain.controls.set_status(
+                    i18n._("move too fast").format(num=self.katrain.config("timer/minimal_use", 0)), STATUS_TEACHING
+                )
+            else:
+                katrain("play", self.ghost_stone)
+                self.play_stone_sound()
         elif not self.ghost_stone:
             xd, xp = self._find_closest(touch.x, self.gridpos_x)
             yd, yp = self._find_closest(touch.y, self.gridpos_y)
diff --git a/katrain/gui/controlspanel.py b/katrain/gui/controlspanel.py
index 245c0bd..fb5f351 100644
--- a/katrain/gui/controlspanel.py
+++ b/katrain/gui/controlspanel.py
@@ -71,6 +71,8 @@ class ControlsPanel(BoxLayout):
         self.active_comment_node = None
         self.last_timer_update = (None, 0, False)
         self.beep = SoundLoader.load("sounds/countdownbeep.wav")
+        self.boing = SoundLoader.load("sounds/boing.wav")
+        self.boing.volume = 0.1
         self.beep_start = 5.2
         self.timer_interval = 0.07
 
@@ -149,11 +151,13 @@ class ControlsPanel(BoxLayout):
         self.info.text = info
 
     def update_timer(self, _dt):
-        current_node = self.katrain and self.katrain.game and self.katrain.game.current_node
+        game =  self.katrain and self.katrain.game
+        current_node = game and self.katrain.game.current_node
         if current_node:
             last_update_node, last_update_time, beeping = self.last_timer_update
             new_beeping = beeping
             now = time.time()
+            main_time =  self.katrain.config("timer/main_time",0) * 60
             byo_len = max(1, self.katrain.config("timer/byo_length"))
             byo_num = max(1, self.katrain.config("timer/byo_periods"))
             sounds_on = self.katrain.config("timer/sound")
@@ -161,9 +165,16 @@ class ControlsPanel(BoxLayout):
             ai = player.ai
             used_period = False
 
+            min_use = self.katrain.config("timer/minimal_use", 0)
+            boing_at_remaining = byo_len - min_use
+            main_time_remaining = main_time - game.main_time_used
+
             if not self.timer.paused and not ai and self.katrain.play_analyze_mode == MODE_PLAY:
                 if last_update_node == current_node and not current_node.children:
-                    current_node.time_used += now - last_update_time
+                    if main_time_remaining > 0:
+                        game.main_time_used += now - last_update_time
+                    else:
+                        current_node.time_used += now - last_update_time
                 else:
                     current_node.time_used = 0
                     new_beeping = False
@@ -173,6 +184,7 @@ class ControlsPanel(BoxLayout):
                     time_remaining += byo_len
                     player.periods_used += 1
                     used_period = True
+
                 if (
                     self.beep_start - 2 * self.timer_interval < time_remaining < self.beep_start
                     and player.periods_used < byo_num
@@ -180,6 +192,18 @@ class ControlsPanel(BoxLayout):
                     new_beeping = True
                 elif time_remaining > self.beep_start:
                     new_beeping = False
+
+                if (
+                    min_use
+                    and not new_beeping
+                    and self.boing
+                    and boing_at_remaining - self.timer_interval
+                    < time_remaining
+                    < boing_at_remaining + self.timer_interval
+                    and player.periods_used < byo_num
+                ):
+                    self.boing.play()
+
             else:
                 new_beeping = False
 
@@ -198,4 +222,7 @@ class ControlsPanel(BoxLayout):
 
             self.last_timer_update = (current_node, now, new_beeping)
 
-            self.timer.state = (max(0, time_remaining), max(0, periods_rem), ai)
+            if main_time_remaining > 0:
+                self.timer.state = (main_time_remaining, None, ai)
+            else:
+                self.timer.state = (max(0, time_remaining), max(0, periods_rem), ai)
diff --git a/katrain/i18n/locales/cn/LC_MESSAGES/katrain.mo b/katrain/i18n/locales/cn/LC_MESSAGES/katrain.mo
index 7254b38..36b6916 100644
Binary files a/katrain/i18n/locales/cn/LC_MESSAGES/katrain.mo and b/katrain/i18n/locales/cn/LC_MESSAGES/katrain.mo differ
diff --git a/katrain/i18n/locales/cn/LC_MESSAGES/katrain.po b/katrain/i18n/locales/cn/LC_MESSAGES/katrain.po
index 2622d3a..91de790 100644
--- a/katrain/i18n/locales/cn/LC_MESSAGES/katrain.po
+++ b/katrain/i18n/locales/cn/LC_MESSAGES/katrain.po
@@ -640,3 +640,15 @@ msgstr "寻找其他走法"
 #. status message
 msgid "alternative analysis"
 msgstr "正在搜索其他走法"
+
+#. TODO - ignore moves if timer is on and less than this is used
+msgid "minimal time use"
+msgstr "Minimal time use in byo-yomi (s)"
+
+#. TODO
+msgid "move too fast"
+msgstr "Think for at least {num} seconds before playing."
+
+#. TODO - in minutes
+msgid "main time"
+msgstr "Main time (min.)"
diff --git a/katrain/i18n/locales/de/LC_MESSAGES/katrain.mo b/katrain/i18n/locales/de/LC_MESSAGES/katrain.mo
index 5c942fc..34b36de 100644
Binary files a/katrain/i18n/locales/de/LC_MESSAGES/katrain.mo and b/katrain/i18n/locales/de/LC_MESSAGES/katrain.mo differ
diff --git a/katrain/i18n/locales/de/LC_MESSAGES/katrain.po b/katrain/i18n/locales/de/LC_MESSAGES/katrain.po
index 722e7ce..93dc91b 100644
--- a/katrain/i18n/locales/de/LC_MESSAGES/katrain.po
+++ b/katrain/i18n/locales/de/LC_MESSAGES/katrain.po
@@ -689,3 +689,15 @@ msgstr "Finde alternative Züge"
 #.  - status message
 msgid "alternative analysis"
 msgstr "Suche nach alternativen Zügen"
+
+#. TODO - ignore moves if timer is on and less than this is used
+msgid "minimal time use"
+msgstr "Minimal time use in byo-yomi (s)"
+
+#. TODO
+msgid "move too fast"
+msgstr "Think for at least %d seconds before playing."
+
+#. TODO - in minutes
+msgid "main time"
+msgstr "Main time (min.)"
diff --git a/katrain/i18n/locales/en/LC_MESSAGES/katrain.mo b/katrain/i18n/locales/en/LC_MESSAGES/katrain.mo
index 9c7f8dc..8ad3bbd 100644
Binary files a/katrain/i18n/locales/en/LC_MESSAGES/katrain.mo and b/katrain/i18n/locales/en/LC_MESSAGES/katrain.mo differ
diff --git a/katrain/i18n/locales/en/LC_MESSAGES/katrain.po b/katrain/i18n/locales/en/LC_MESSAGES/katrain.po
index c5b79e3..92f8f8f 100644
--- a/katrain/i18n/locales/en/LC_MESSAGES/katrain.po
+++ b/katrain/i18n/locales/en/LC_MESSAGES/katrain.po
@@ -293,14 +293,25 @@ msgid "timer settings"
 msgstr "Adjust Timer Settings"
 
 msgid "byoyomi length"
-msgstr "Time per Byo-yomi Period"
+msgstr "Time per byo-yomi period (s)"
 
 msgid "byoyomi periods"
-msgstr "Number of Periods"
+msgstr "Number of periods"
 
 msgid "count down sound"
 msgstr "Sound on"
 
+#. in minutes
+msgid "main time"
+msgstr "Main time (min.)"
+
+#. ignore moves if timer is on and less than this is used
+msgid "minimal time use"
+msgstr "Minimal time use in byo-yomi (s)"
+
+msgid "move too fast"
+msgstr "Think for at least {num} seconds before playing."
+
 #. submit button
 msgid "update timer"
 msgstr "Update Timer"
diff --git a/katrain/i18n/locales/es/LC_MESSAGES/katrain.mo b/katrain/i18n/locales/es/LC_MESSAGES/katrain.mo
index 75031f1..eebeda8 100644
Binary files a/katrain/i18n/locales/es/LC_MESSAGES/katrain.mo and b/katrain/i18n/locales/es/LC_MESSAGES/katrain.mo differ
diff --git a/katrain/i18n/locales/es/LC_MESSAGES/katrain.po b/katrain/i18n/locales/es/LC_MESSAGES/katrain.po
index 1124967..d7f32a2 100644
--- a/katrain/i18n/locales/es/LC_MESSAGES/katrain.po
+++ b/katrain/i18n/locales/es/LC_MESSAGES/katrain.po
@@ -697,3 +697,15 @@ msgstr "Find alternative moves"
 #. TODO - status message
 msgid "alternative analysis"
 msgstr "Searching for alternative moves"
+
+#. TODO - ignore moves if timer is on and less than this is used
+msgid "minimal time use"
+msgstr "Minimal time use in byo-yomi (s)"
+
+#. TODO
+msgid "move too fast"
+msgstr "Think for at least {num} seconds before playing."
+
+#. TODO - in minutes
+msgid "main time"
+msgstr "Main time (min.)"
diff --git a/katrain/i18n/locales/fr/LC_MESSAGES/katrain.mo b/katrain/i18n/locales/fr/LC_MESSAGES/katrain.mo
index 83b7aa1..09a9c96 100644
Binary files a/katrain/i18n/locales/fr/LC_MESSAGES/katrain.mo and b/katrain/i18n/locales/fr/LC_MESSAGES/katrain.mo differ
diff --git a/katrain/i18n/locales/fr/LC_MESSAGES/katrain.po b/katrain/i18n/locales/fr/LC_MESSAGES/katrain.po
index bb070f0..28f1c6c 100644
--- a/katrain/i18n/locales/fr/LC_MESSAGES/katrain.po
+++ b/katrain/i18n/locales/fr/LC_MESSAGES/katrain.po
@@ -721,3 +721,15 @@ msgstr "Proposer des coups différents"
 
 msgid "alternative analysis"
 msgstr "Recherche de coups différents."
+
+#. TODO - ignore moves if timer is on and less than this is used
+msgid "minimal time use"
+msgstr "Minimal time use in byo-yomi (s)"
+
+#. TODO
+msgid "move too fast"
+msgstr "Think for at least {num} seconds before playing."
+
+#. TODO - in minutes
+msgid "main time"
+msgstr "Main time (min.)"
diff --git a/katrain/i18n/locales/jp/LC_MESSAGES/katrain.mo b/katrain/i18n/locales/jp/LC_MESSAGES/katrain.mo
index 9c28dd2..206ae2d 100644
Binary files a/katrain/i18n/locales/jp/LC_MESSAGES/katrain.mo and b/katrain/i18n/locales/jp/LC_MESSAGES/katrain.mo differ
diff --git a/katrain/i18n/locales/jp/LC_MESSAGES/katrain.po b/katrain/i18n/locales/jp/LC_MESSAGES/katrain.po
index 705244c..b4b9b4f 100644
--- a/katrain/i18n/locales/jp/LC_MESSAGES/katrain.po
+++ b/katrain/i18n/locales/jp/LC_MESSAGES/katrain.po
@@ -679,3 +679,15 @@ msgstr ""
 #. status message
 msgid "alternative analysis"
 msgstr "他の候補手を分析中"
+
+#. TODO - ignore moves if timer is on and less than this is used
+msgid "minimal time use"
+msgstr "Minimal time use in byo-yomi (s)"
+
+#. TODO
+msgid "move too fast"
+msgstr "Think for at least {num} seconds before playing."
+
+#. TODO - in minutes
+msgid "main time"
+msgstr "Main time (min.)"
diff --git a/katrain/i18n/locales/ko/LC_MESSAGES/katrain.mo b/katrain/i18n/locales/ko/LC_MESSAGES/katrain.mo
index c14eca3..6739fb1 100644
Binary files a/katrain/i18n/locales/ko/LC_MESSAGES/katrain.mo and b/katrain/i18n/locales/ko/LC_MESSAGES/katrain.mo differ
diff --git a/katrain/i18n/locales/ko/LC_MESSAGES/katrain.po b/katrain/i18n/locales/ko/LC_MESSAGES/katrain.po
index eaf984b..0e89d0b 100644
--- a/katrain/i18n/locales/ko/LC_MESSAGES/katrain.po
+++ b/katrain/i18n/locales/ko/LC_MESSAGES/katrain.po
@@ -654,3 +654,15 @@ msgstr "다른 수 찾기"
 
 msgid "alternative analysis"
 msgstr "다른 수를 찾는 중입니다"
+
+#. TODO - ignore moves if timer is on and less than this is used
+msgid "minimal time use"
+msgstr "Ignore moves faster than <this many> seconds"
+
+#. TODO
+msgid "move too fast"
+msgstr "Think for at least {num} seconds before playing."
+
+#. TODO - in minutes
+msgid "main time"
+msgstr "Main time (min.)"
diff --git a/katrain/i18n/locales/ru/LC_MESSAGES/katrain.mo b/katrain/i18n/locales/ru/LC_MESSAGES/katrain.mo
index 5459d12..b62d3c0 100644
Binary files a/katrain/i18n/locales/ru/LC_MESSAGES/katrain.mo and b/katrain/i18n/locales/ru/LC_MESSAGES/katrain.mo differ
diff --git a/katrain/i18n/locales/ru/LC_MESSAGES/katrain.po b/katrain/i18n/locales/ru/LC_MESSAGES/katrain.po
index bfed209..cc87c03 100644
--- a/katrain/i18n/locales/ru/LC_MESSAGES/katrain.po
+++ b/katrain/i18n/locales/ru/LC_MESSAGES/katrain.po
@@ -684,3 +684,15 @@ msgstr "Поискать альтернативные ходы"
 
 msgid "alternative analysis"
 msgstr "Поиск альтернативных ходов"
+
+#. TODO - ignore moves if timer is on and less than this is used
+msgid "minimal time use"
+msgstr "Minimal time use in byo-yomi (s)"
+
+#. TODO
+msgid "move too fast"
+msgstr "Think for at least {num} seconds before playing."
+
+#. TODO - in minutes
+msgid "main time"
+msgstr "Main time (min.)"
diff --git a/katrain/popups.kv b/katrain/popups.kv
index c9c5265..83c44b4 100644
--- a/katrain/popups.kv
+++ b/katrain/popups.kv
@@ -319,9 +319,15 @@
 <ConfigTimerPopup>:
     MDGridLayout:
         cols: 2
-        rows: 3
+        rows: 5
         spacing: 1.5 * CP_SPACING
         size_hint: 1,2.5
+        DescriptionLabel:
+            text: i18n._('main time')
+        AnchorLayout:
+            LabelledIntInput:
+                text: "10"
+                input_property: "timer/main_time"
         DescriptionLabel:
             text: i18n._('byoyomi length')
         AnchorLayout:
@@ -334,6 +340,12 @@
             LabelledIntInput:
                 text: "5"
                 input_property: "timer/byo_periods"
+        DescriptionLabel:
+            text: i18n._('minimal time use')
+        AnchorLayout:
+            LabelledIntInput:
+                text: "0"
+                input_property: "timer/minimal_use"
         DescriptionLabel:
             text: i18n._('count down sound')
         AnchorLayout:
diff --git a/katrain/sounds/boing.wav b/katrain/sounds/boing.wav
new file mode 100644
index 0000000..2cee3df
Binary files /dev/null and b/katrain/sounds/boing.wav differ