hey..I dont know..but im in the same situation...Want to do it together?? I need to drop down from a 10/12 to a 6/8...If you want to do it together..let me know! :) Just send me an email :) But I have heard it's around 30lbs..if you do a strict water fast....or a 1lb a day after day 3..but you drop the most weight in the first couple of days..