I just read the current draft out loud, without pausing for scene changes, additional sound effects, or comedic timing, and it took six minutes. And that's with one scene left to write. This isn't going to be a
fiver, strictly speaking, if you don't mind going a few minutes over the limit.
Otherwise there are a few bits I could cut.
I was pleasantly surprised. I figured I'd have my hands full just keeping track of who was talking, but I managed to get a handle on the main parts' names well enough. And when I got to the second episode, the jokes came easily enough that I quickly decided that would be the episode I'd tackle. All in all, it was surprisingly painless.
Having a good storyline didn't hurt either.
[edit]I'll try to do one more, "Wildfire".