diff --git a/mt_clockwheel.py b/mt_clockwheel.py
index 221542b..daae644 100644
--- a/mt_clockwheel.py
+++ b/mt_clockwheel.py
@@ -106,7 +106,20 @@ def build_day(this_date):
         if verbose:
             print('  added program:', json.dumps(entry), length)
 
-    # TODO: see if playlist_duration is a factor of 24 * 60 * 60 and, if so, duplicate it to fill 24 hours
+    day_length = 24 * 60 * 60
+    if day_length % playlist_duration == 0:
+        if verbose:
+            print("looping playlist...")
+        iterations = (day_length / playlist_duration) 
+        iteration = d["program"] # snapshot of the unit of iteration
+        looped = []
+        if verbose:
+            print("iteration: ", json.dumps(iteration, indent=4))
+            print("iterations: ", iterations)
+        while iterations > 0:
+            looped.extend(iteration)
+            iterations -= 1
+        d["program"] = looped
 
     playlist = json.dumps(d)
     if verbose: