diff --git a/apps/openmw/mwgui/jailscreen.cpp b/apps/openmw/mwgui/jailscreen.cpp
index c6aefdd177..2fbaa8d8ac 100644
--- a/apps/openmw/mwgui/jailscreen.cpp
+++ b/apps/openmw/mwgui/jailscreen.cpp
@@ -23,7 +23,6 @@ namespace MWGui
         : WindowBase("openmw_jail_screen.layout")
         , mDays(1)
         , mFadeTimeRemaining(0)
-        , mTimeAdvancer(0.01f)
     {
         getWidget(mProgressBar, "ProgressBar");
 
diff --git a/apps/openmw/mwgui/timeadvancer.cpp b/apps/openmw/mwgui/timeadvancer.cpp
index 2cdab127b9..c4bdc030c2 100644
--- a/apps/openmw/mwgui/timeadvancer.cpp
+++ b/apps/openmw/mwgui/timeadvancer.cpp
@@ -1,14 +1,19 @@
 #include "timeadvancer.hpp"
 
+namespace
+{
+    // Time per hour tick
+    constexpr float kProgressStepDelay = 1.0f / 60.0f;
+}
+
 namespace MWGui
 {
-    TimeAdvancer::TimeAdvancer(float delay)
+    TimeAdvancer::TimeAdvancer()
         : mRunning(false)
         , mCurHour(0)
         , mHours(1)
         , mInterruptAt(-1)
-        , mDelay(delay)
-        , mRemainingTime(delay)
+        , mRemainingTime(kProgressStepDelay)
     {
     }
 
@@ -17,7 +22,7 @@ namespace MWGui
         mHours = hours;
         mCurHour = 0;
         mInterruptAt = interruptAt;
-        mRemainingTime = mDelay;
+        mRemainingTime = kProgressStepDelay;
 
         mRunning = true;
     }
@@ -43,7 +48,7 @@ namespace MWGui
 
         while (mRemainingTime <= 0)
         {
-            mRemainingTime += mDelay;
+            mRemainingTime += kProgressStepDelay;
             ++mCurHour;
 
             if (mCurHour <= mHours)
diff --git a/apps/openmw/mwgui/timeadvancer.hpp b/apps/openmw/mwgui/timeadvancer.hpp
index bb6aa649cb..e69153aed4 100644
--- a/apps/openmw/mwgui/timeadvancer.hpp
+++ b/apps/openmw/mwgui/timeadvancer.hpp
@@ -8,7 +8,7 @@ namespace MWGui
     class TimeAdvancer
     {
     public:
-        TimeAdvancer(float delay);
+        TimeAdvancer();
 
         void run(int hours, int interruptAt = -1);
         void stop();
@@ -32,7 +32,6 @@ namespace MWGui
         int mHours;
         int mInterruptAt;
 
-        float mDelay;
         float mRemainingTime;
     };
 }
diff --git a/apps/openmw/mwgui/trainingwindow.cpp b/apps/openmw/mwgui/trainingwindow.cpp
index 890aa0ba68..4bde77a552 100644
--- a/apps/openmw/mwgui/trainingwindow.cpp
+++ b/apps/openmw/mwgui/trainingwindow.cpp
@@ -27,7 +27,6 @@ namespace MWGui
 
     TrainingWindow::TrainingWindow()
         : WindowBase("openmw_trainingwindow.layout")
-        , mTimeAdvancer(0.05f)
     {
         getWidget(mTrainingOptions, "TrainingOptions");
         getWidget(mCancelButton, "CancelButton");
diff --git a/apps/openmw/mwgui/waitdialog.cpp b/apps/openmw/mwgui/waitdialog.cpp
index 222a34e53b..9609def96d 100644
--- a/apps/openmw/mwgui/waitdialog.cpp
+++ b/apps/openmw/mwgui/waitdialog.cpp
@@ -52,7 +52,6 @@ namespace MWGui
 
     WaitDialog::WaitDialog()
         : WindowBase("openmw_wait_dialog.layout")
-        , mTimeAdvancer(0.05f)
         , mSleeping(false)
         , mHours(1)
         , mManualHours(1)