Update app.py

app.py

@@ -147,7 +147,7 @@ opt.colors = [
     # '#FECAC0',
 ]
 opt.excluded_keys = ['inpainting_mode', 'is_running', 'active_palettes', 'current_palette', 'model']
-opt.prep_time = 12
+opt.prep_time = 20
 
 
 ### Event handlers
@@ -1063,7 +1063,7 @@ async () => {{
 
     function timer(totalTime, deadline) {{
         var time = totalTime * 1000;
-        var dayDuration = time / deadline;
+        var dayDuration = time / (deadline + {opt.prep_time});
         var actualDay = deadline + {opt.prep_time};
 
         var timer = setInterval(countTime, dayDuration);