you're best just dieting down slowly over a period of time. not only will this help you prevent a rebound, but it will also minimize strength loss and allow your body to adapt steadily to a decrease in calories. just a thought. of course, you could drop all that weight relatively quickly. but, as others here have said, you'll probably experience a sudden rebound when you come off the diet and gain part of that weight back - while you'll be left with less size and strength. also, your body type and metabolism will play a large role in determining how fast you can actually lose that weight.