As long as you rest the first 20 minutes, after that you can move around if you want too. I did not save that post, this is just on memory. There is even a flush where grandma walked the whole night.
Your flush was succesful as long as you get something out, chaff is fine stone, don't get too hung up about the amount of stones. I never had many like some people are talking about, but my health was getting better. At least you are detoxing and probably loosening stones which will come out some other time.