Quick Question

Comedy Central broadcasts each episode of The Daily Show and The Colbert Report several times a day. Can anyone here explain why the second broadcasts of each are now starting at eight minutes past their announced times? On my satellite dish, the first broadcasts are supposed to be at 8:00 PM and 8:30 PM, and the second ones at 11:00 PM and 11:30 PM. Lately, the second broadcasts have been more like 11:08 PM and 11:38 PM. What's running over and why?