Like I said, a sketch is one joke. They shouldn't really be more than a minute, two minutes. There are some shows where the sketch goes on for five minutes. It's like, "I get it! I'm already bored. I did like the joke, but I don't anymore, because you went on too long."
Eric AndreWonder Showzen was one of the first shows that realized each sketch, each segment is essentially one joke, and, once you know what the joke is, it's time to move on.
Eric Andre