NOT that i am recommending it, but the only way i could think to lose even close to that much weight in that amount of time would be a very harsh DNP cycle.

Even then i dont think it would be possible without totally destroying your build! Wow fvck that, i'd rather get down to around 10% in that amount of time, and retain all(or most) of my muscle mass. IMO you'd look better at 10% with your muscle retained than you would 5% with no muscle at all!