To tell you guys the truth, I've always found my endurance from playing a consistent practice routine everyday. At one point before Iraq I was playing 6 hours a day. Now, I'm playing about 4 hours a day or two on days with gigs. Different Strokes I guess. -J Oh, and if you don't take breaks appropriately, your just burning your chops out early in my experience. If I rest 10-15 minutes an hour I can play MUCH longer.