Enhancement for issue #546

diff --git a/src/seedsigner/controller.py b/src/seedsigner/controller.py
index 5141723..ea7c9e8 100644
--- a/src/seedsigner/controller.py
+++ b/src/seedsigner/controller.py
@@ -11,6 +11,7 @@ from seedsigner.models.psbt_parser import PSBTParser
 from seedsigner.models.seed import Seed
 from seedsigner.models.seed_storage import SeedStorage
 from seedsigner.models.settings import Settings
+from seedsigner.models.settings import SettingsConstants
 from seedsigner.models.singleton import Singleton
 from seedsigner.models.threads import BaseThread
 from seedsigner.views.screensaver import ScreensaverScreen
@@ -252,7 +253,7 @@ class Controller(Singleton):
             * initial_destination: The first View to run. If None, the MainMenuView is
             used. Only used by the test suite.
         """
-        from seedsigner.views import MainMenuView, BackStackView
+        from seedsigner.views import MainMenuView, BackStackView, RemoveMicroSDWarningView
         from seedsigner.views.screensaver import OpeningSplashView
         from seedsigner.gui.toast import RemoveSDCardToastManagerThread
 
@@ -290,7 +291,10 @@ class Controller(Singleton):
                 next_destination = Destination(MainMenuView)
             
             # Set up our one-time toast notification tip to remove the SD card
-            self.activate_toast(RemoveSDCardToastManagerThread())
+            if self.settings.get_value(SettingsConstants.SETTING__MICROSD_TOAST_TIMER) == SettingsConstants.MICROSD_TOAST_TIMER_FIVE_SECONDS:
+                self.activate_toast(RemoveSDCardToastManagerThread())
+            elif self.settings.get_value(SettingsConstants.SETTING__MICROSD_TOAST_TIMER) == SettingsConstants.MICROSD_TOAST_TIMER_FOREVER:
+                next_destination = Destination(RemoveMicroSDWarningView)
 
             while True:
                 # Destination(None) is a special case; render the Home screen
diff --git a/src/seedsigner/gui/toast.py b/src/seedsigner/gui/toast.py
index f75d6a6..2f7a406 100644
--- a/src/seedsigner/gui/toast.py
+++ b/src/seedsigner/gui/toast.py
@@ -201,11 +201,11 @@ class BaseToastOverlayManagerThread(BaseThread):
 
 
 class RemoveSDCardToastManagerThread(BaseToastOverlayManagerThread):
-    def __init__(self, activation_delay: int = 3, duration: int = 1e6):
+    def __init__(self, activation_delay: int = 3, duration: int = 5):
         """
             * activation_delay: configurable so the screenshot generator can get the
                 toast to immediately render.
-            * duration: default value is essentially forever. Overrideable for the
+            * duration: default value is 5 seconds. Overrideable for the
                 screenshot generator.
         """
         super().__init__(
diff --git a/src/seedsigner/models/settings_definition.py b/src/seedsigner/models/settings_definition.py
index a036956..2a6a1d7 100644
--- a/src/seedsigner/models/settings_definition.py
+++ b/src/seedsigner/models/settings_definition.py
@@ -293,6 +293,15 @@ class SettingsConstants:
         (CUSTOM_DERIVATION, _mft("Custom Derivation")),
     ]
 
+    MICROSD_TOAST_TIMER_DISABLED = "D"
+    MICROSD_TOAST_TIMER_FIVE_SECONDS = "E"
+    MICROSD_TOAST_TIMER_FOREVER = "inf"
+    ALL_MICROSD_TOAST_TIMERS = [
+        (MICROSD_TOAST_TIMER_DISABLED, "Disabled"),
+        (MICROSD_TOAST_TIMER_FIVE_SECONDS, "5 seconds"),
+        (MICROSD_TOAST_TIMER_FOREVER, "Until SD removed")
+    ]
+
     WORDLIST_LANGUAGE__ENGLISH = "en"
     WORDLIST_LANGUAGE__CHINESE_SIMPLIFIED = "zh_Hans_CN"
     WORDLIST_LANGUAGE__CHINESE_TRADITIONAL = "zh_Hant_TW"
@@ -339,6 +348,7 @@ class SettingsConstants:
     SETTING__DIRE_WARNINGS = "dire_warnings"
     SETTING__QR_BRIGHTNESS_TIPS = "qr_brightness_tips"
     SETTING__PARTNER_LOGOS = "partner_logos"
+    SETTING__MICROSD_TOAST_TIMER = "microsd_toast_timer"
 
     SETTING__DEBUG = "debug"
 
@@ -665,6 +675,14 @@ class SettingsDefinition:
                       help_text=_mft("Native Segwit only"),
                       visibility=SettingsConstants.VISIBILITY__ADVANCED,
                       default_value=SettingsConstants.OPTION__DISABLED),
+        
+        SettingsEntry(category=SettingsConstants.CATEGORY__FEATURES,
+                      attr_name=SettingsConstants.SETTING__MICROSD_TOAST_TIMER,
+                      display_name="MicroSD toast timer",
+                      type=SettingsConstants.TYPE__SELECT_1,
+                      visibility=SettingsConstants.VISIBILITY__ADVANCED,
+                      selection_options=SettingsConstants.ALL_MICROSD_TOAST_TIMERS,
+                      default_value=SettingsConstants.MICROSD_TOAST_TIMER_FIVE_SECONDS),
 
         SettingsEntry(category=SettingsConstants.CATEGORY__FEATURES,
                       attr_name=SettingsConstants.SETTING__MESSAGE_SIGNING,
diff --git a/src/seedsigner/views/view.py b/src/seedsigner/views/view.py
index 2c0e3d1..d7e0c26 100644
--- a/src/seedsigner/views/view.py
+++ b/src/seedsigner/views/view.py
@@ -407,3 +407,27 @@ class OptionDisabledView(View):
             return Destination(SettingsEntryUpdateSelectionView, view_args=dict(attr_name=self.settings_attr), clear_history=True)
         else:
             return Destination(MainMenuView, clear_history=True)
+
+
+
+class RemoveMicroSDWarningView(View):
+    CONTINUE = ButtonOption("Continue")
+    DISMISS = ButtonOption("Dismiss")
+
+    def run(self):
+        button_data = [self.CONTINUE, self.DISMISS]
+        selected_menu_num = self.run_screen(
+            WarningScreen,
+            title=_("Action Required"),
+            status_icon_name=SeedSignerIconConstants.MICROSD,
+            status_headline=None,
+            text=_("You must remove the\nMicroSD card to continue."),
+            show_back_button=False,
+            button_data=button_data,
+        )
+
+        from seedsigner.hardware.microsd import MicroSD
+        if button_data[selected_menu_num] == self.CONTINUE and MicroSD.get_instance().is_inserted:
+            return Destination(RemoveMicroSDWarningView, clear_history=True)
+        else:
+            return Destination(MainMenuView, clear_history=True)