I did 8 days the first time, I'm doing 10 or 11 this time (depends and when the syrup is all gone), and I'm planning a 14 day Master-Cleanse just before my birthday, the Big 3-0, in October! I'm still toying with the idea of a series of liver flushes.
My goal is to complete a 14-21 day Master-Cleanse quarterly thereafter. I just needed to work myself up to that point. I never in a million years would have thought I could go 10 days without food, it's a process for me.