My second flush a few weeks ago produced very modest amount of stones the morning after the OO, but it was the NEXT day that I got the best and biggest (tan the size of chick peas). Not a ton, but maybe 20 or 30 the following day. Not the hundreds I often read about, but there's no doubt I feel better than before this last flush. I would say keep checking the toilet the rest of the day and tomorrow, and then also see how you feel in the coming weeks to decide whether it was "successful." I keep reading every flush is different, and if you do another one in a month, it might be really productive. You never know. They say to keep flushing until you see no stones at all.