How many rounds to shoot during practice?

[bountyhunter]

I read an article a while back (Front Sight???) where the author stated that he limits his practice sessions to about 220 rounds. I believe he said something to the effect that if he shot more than that his ability to learn from it would get stale.

You should shoot until you get fatigued. At that point, you will be doing wrong things and your muscles will be learning them. Practice makes perfect as long as you are practicing the right thing.

FWIW, I shoot maybe 200 rounds in about 1 1/2 hours at my practice session. It took a long time and excercise before I could shoot that long without getting wobbly. When I first started shooting, 20 minutes was about my useful limit.