I would say that's about what my permanent weight loss was on my 60 day fast.
However, this is a very intense process, one I would never recommend without professional supervision. Many times I was grateful for the advice and support of my excellent Naturopath, who has fasting experience. I passed a small kidney calcification on day 18, a week-long crisis I was able to fast through with her help, and I had another major crisis at day 57 that would have freaked me out without a pro.
Also, I lost hair by the handsful for about two months after breaking the fast. She explained the metabolic changes taking place, and assured me that the hair would return (it did).
Sixty sounds good going in, but it's a long row to hoe! Do your homework and do it right.