probably not a exact amount that works,,shooting the bow does seem to put a different stress on the bow, and I start shooting mine at about 20 inches as I tiller it out,, so have shot it quite a bit by the time I get to final draw length,, depends on the wood and design 200 arrows may not reveal the final unbraced profile of the bow,, or it might,, thats the thing about wood bows,,, it just depends,, on alot of factors ,, length of hold,, moisture content etc etc etc,,
but I agree if it is not broke after several 100 shots and the tiller is not shifting,,, probably ok,,,