It's OK to practice shooting a bunch of arrows but I always focus on the first shot of any practice session. It's the first shot that counts and I would rather shoot one good arrowand put the bow down than shoot 20 arrows fast and furious.
Keep the muscles tuned and tonedbut focus on ONE arrow. I also like to make my first shot at adiif angle or target so it forces my mind into pinning down the distance. Shooting at set distances all the time is uncool..Mix it up.