The Liver Flush is a 2-3 day thing, and works great following the MC. I even did my last one in the middle of the MC, but substituted apple juice for a few lemonades for 1 day.
I'm including a link to the Liver Flush I use. It's here on curezone. No "fasting" involved except for the day of the flush you can not have ANY fats, and stop eating at 2 pm. I always move the times 2 hrs later and it still works.
You may want to check out Stephen Arlin's book: RAW POWER. Here's a link to testimonials about it. At the bottom of the page are more links. http://www.rawfood.com/testimonialsrp.html