I don't know the answer to your question, but I hope to find out soon.
Moritz and Clark both recommend lying down immediately after drinking the OO/citrus. However, Moritz recommends doing light exercise in the morning, after the 3rd ES drink. I think it would be ok 8 hours after the drink, but not immediately after.
So I intend to do some light rebounding after the 3rd ES drink in the morning, more after the 4th ES drink, and I'll let you know what happens. I do my next Liver Flush this Thursday-Friday (June 7-8).