GMS
If you are asking me, well, even if you weren't, I'll answer! ;)
I jumped right in to a steady 3 shakes a day. Not being the type of person to start out slow, I just started with three and was always heavy on the B, even in the beginning.
The nasty stuff started coming out about day 11. Freaked me out. I had no idea that such scary stuff was stuck inside of me. I'm a healthy, slim 38 year old guy, for crying out loud! I passed the stuff for a good few weeks, maybe more. It slowly began to taper of, however, becoming less and less. But a few weeks ago, I could tell something was 'different' about a BM, and sure enough, a whole bunch more came out...this happened twice!
I still take the shakes, just not 3 a day anymore.
And one tip to make them more palatable. Use water that is as warm as you can stand it, put the B in first...then spoon in the P and stir it up before it sets up...then guzzle. I actually don't mind the taste, but when it turns all gooey and slimey...that's what I can't stand.
Good luck...keep at it. I firmly believe that everyone who has never done this cleanse has MP...even the doctors who say that it doesn't exist. I wish I had taken pictures just to show the doubters! ;)