It's sooooooooooooo hard to say how many flushes it takes to be stone free. Everyone is different and for everyone, there are different results.
I have read on this website that some people are stone free after 6-7 flushes and others are still seeing stones after 10-11 flushes! It seems like I read the other day about someone who is still seeing stones after 17 flushes. That was amazing to me!
But, the important thing is to know that with each flush and every stone that you remove is one step closer to better health!