As I read through bunches of threads, I realize that my band is pretty unique about our sets. We play only 1. If the show is 1 hour, 2 hours, or 4 hours, we only play 1 set. No breaks. We rarely end a tune and we never talk. Nothing but a full on musical experience. I have not talked with many other "Jam Band" bassists or musicians, but what do you all do? Breaks for us, stop the flow and interrupt what could be. They allow people to leave the venue and give the band members time to belly up to the bar. While a 4 hour set can be physically challanging, it offers a mind and body experience for the band as well as the audience.