When I practice I like to shoot about 40 arrows. I usually shoot 7-8 rounds of 5 arrows. I may shoot 1 round at 20, 1 at 25, 3 at 30, 1 at 40, 1-2 at 50yds.

Too much shooting can result in lost accuracy. I also find that I shoot best if I skip a day or 2 between sessions.