Don't take this as a prediction of your circumstances, I have flushed over 20 times and stones are still coming by the hundreds, however there have been a few flushes where as little as 30 to 50 stones come out, then the next time there will be one or two hundred or more. I put it down to different parts of the liver emptying, and the stones shifting around.
I hope your liver is cleaning much faster than mine has been, personally I would keep flushing a few more times after there were no more stones coming out, just to make sure.