I hover around the 5 minute mark most of the time. It's a good compromise for DJs and vinyl cuts. Most DJs are pretty slow at beatmatching and can't mix a 3 or 4 minute track well, and if you have a 8min+ track it won't be as loud on vinyl. At the 5-6 minute mark you can get your message across quickly, the DJ can't complain about not having enough time, and the cut still sounds damn good.