It would probably take me an hour to two to write it down, get the feel of it, and that's with quite a few changes. It's not really a hard thing for me to do.
Comedy is similar to hockey... in only one way. You get a lot of credit for assists. So I try to serve whatever the intention is, be it the joke or the story or the scene or the moment or the kiss, even if it's not my joke or moment.
I'm lucky enough that directors sometimes seek me out for little projects that people don't even know about, that just surface later on.