diff --git a/1.3/Assemblies/RJW_Menstruation.dll b/1.3/Assemblies/RJW_Menstruation.dll
index 14e7797..e70cb9c 100644
Binary files a/1.3/Assemblies/RJW_Menstruation.dll and b/1.3/Assemblies/RJW_Menstruation.dll differ
diff --git a/1.3/source/RJW_Menstruation/RJW_Menstruation/HediffComps/MenstruationUtility.cs b/1.3/source/RJW_Menstruation/RJW_Menstruation/HediffComps/MenstruationUtility.cs
index 6a068da..caec755 100644
--- a/1.3/source/RJW_Menstruation/RJW_Menstruation/HediffComps/MenstruationUtility.cs
+++ b/1.3/source/RJW_Menstruation/RJW_Menstruation/HediffComps/MenstruationUtility.cs
@@ -253,7 +253,12 @@ namespace RJW_Menstruation
 
         public static float GestationHours(this Hediff_BasePregnancy hediff)
         {
-            return (1 / /*hediff?.progress_per_tick ??*/ 1) / 2500f;
+            if (hediff == null)
+            {
+                Log.Error("Tried to get gestation length without a pregnancy.");
+                return 1f;
+            }
+            else return (hediff.p_end_tick - hediff.p_start_tick) / GenDate.TicksPerHour;
         }
     }