3 years, dozens of flushes. Had a major output, in size and quantity following Humaworm (3 flushes ago). Related to parasites? Don't know. Last 2 were very low content, but I had changed ES. Related to that change? Don't know.(It was proposed that the ES can effect the outcome). I've had consecutive flushes with nothing. Followed by consectutive flushes with a lot. My opinion that stones are are part of a process. Flushing doesn't stop the process, that only comes with, diet, lifestyle change and effect of other protocols. Can't take it in isolation. The liver is a filter. Flush and you keep the filter clean. Don't flush it gets clogged. Your state of health and lifetyle determines how fast. But from one flush to the next, I cannot predict the outcome or why that outcome was what it was.