It was even worse “Turner Time”, where they would start and end all shows 5 minutes pass the hour to make you miss the first 5 minutes of a show on another network to convince you to keep watching.
Comedy Central is doing a similar but different thing. They're adding more commercials to a commercial break, so now a 30 minute block is like 34 minutes, creating a weird stagger in the schedule. MTV does this too, but they play catch up on the occasional episode by cutting out the intro completely, and their schedule stays on the half hour. Both are Viacom networks.