RE: How long are your practice sessions?
I seem to get into a good zone after about 25-30 shots and then seem to stay there till I have shot around 100 arrows. I would say I practice for a good 50 shots on average, and then I have a walk through course at the club I belong to that has 28 animal paper targets on bags that I shoot from unknown distances to practice both shooting and yardage estimation for 3D.