After, I guess 12, or so I know the feeling after expelling quite a few out, it's a great feeling for a couple of days and then here come the clouds and pain again. My results are sporadic, I have no idea if it's going to be a 20-30 smaller stone flush or a couple of hundred including rather larger ones. People have told me I'm a little thin all my life, I'm even thinner now. Interesting comment by beatty about the acid. Others here have chimed in about feeling better and doing it more often, search down through the threads.