My routines vary - the shortest is less than 3 mins, the longest is about 6mins. It depends on your act. Personally I prefer shorter routines as I think when something's too long, it gets boring - I saw a routine once where the performer used about 3 or 4 songs and only actually did a striptease during the last song and I know I was bored, I thinka few people in the audience were, especially since there wasn't a "storyline" with it - my routines all have a character or a story to them.
It's personal preference I suppose
