I honestly do not know. In the year 2000, I flushed until I saw no more stones.....and I am thinking it was 8-9 flushes.
After that, it's been maintenance flushes. But, I can promise you this, after I got rid of the stones, I have seen a few stones, but nothing like that first year.
One thing you have to remember.......What you eat determines your health. I am the first to admit that I will eat sooooooooooo healthy and then BAM! I want ice cream or something so unhealthy and I cave. Then, I slap myself back into reality. Right now, I am eating healthy. I just hope it lasts.