Long story short, I'm a runner and have performed Liver Flushes for a long list of reasons I won't get into here, but I have found that the flush actually sets me back relative to how far and how fast I can run, for about 5 days. At 10-12 days after the flush I reach a peak in performance that was not achievable prior to the flush.
As Belle said, everyone's different, but I'm just suggesting that you may not feel any positive difference for about a week, which is why Dr Clark recommends a two week interval between flushes. There seems to be a recovery period of at least a week for me.