I've had them last from one that got 5 shots to a few that made it to the 100 mark (+ or -). One flint kept shooting and self knapping until I just stopped counting shots. I finally retired it when it wore so far back that the cock couldn't hold it; it was nothing more than a flake of stone. In general I get at least 25 shots before any knapping is required. After knapping it usually keeps going that long again or longer. Saying "average" really doesn't mean that much considering the wide variation in quality. But if I had to speculate I'd guess 30 to 60 shots.