My liquid diet was 3 weeks, I lost 40 lbs and I had three per day and a small meal at night. I had my surgery on April 29 and I am already down a total of 60lbs from April 8th when I started the diet. That seems like a very long diet, but the thing that go me through it was the end game and the benefits that come with it, the first week sucks but after the head aches and light headed-ness goes away you will be in a state of ketosis. This is where your body eats Protein and then fat reserves for fuel. Just make sure your drinking enough Water and you should do fine, also Tylenol helps in the first week. Good luck
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