Assuming that you aren't using thermogenics or any other supplements to accelerate the process, I would say 8 weeks or so.

I am looking at my bodyfat log that I have kept (yes, I have one), and in 6/99 I was 202 lbs. at 13.2% ... by 7/14/99 I was 198 lbs. at 10.6% ... I was using a thermogenic at the time (Adipokinetix)and just coming off of a bulk cycle, if that helps you any.

I am also 6'3"