How much weight do you lose on the first two weeks of the atkins diet?

The first two weeks are very tough, but most people will loose 7-10 lbs. However, I have a friend who didn't loose anything for at least 1 month. But she kept at it. She lost at least 75 lbs and has only put on about 10 of those in the last 4 years. She remains low-carb to this day.