I personally have only ever lost a maximum of 8 lbs in a week, but when I was doing LL one of the guys doing the diet lost 1 lb short of 2 stone in his first week ..... 23 lbs in 1 week. He carried on with the big losses for a few more weeks at 10 or 12 lbs a week, and totalled nearly 4 stone in his first month. Then he hit problems .... he got gout, amongst other things, and his losses tailed off until he went 3 or 4 weeks without losing a thing - in fact he put 1 lb back on. The LLC was totally and utterly unsupportive and basically blasted him for "breaking the diet and lying about it" which I thought was over the top and totally uncalled for ...... and that was the point at which I decided I would be jumping ship as soon as I could and move to CD.
Naturally, the guy stopped coming to LL, and I have no idea what happenned to him after that .....
He was doing so well, and amazingly it was the LLC herself that derailed him .....