It can take a while, I know that from experience. When I first came out, at 23, I got in what I considered good shape over the space of a summer: 6'1, 185, and swimming and biking a LOT. (This was before triathlons became popular, LOL!) I kept myself in trim until I was 43, when I was struck by a hit-and-run driver while cycling in DC and officially disabled x 6 months and really out-of-shape 3 years. I took a sabbatical in 2000 and got myself back into fairly decent shape over the space of about 9 months: 6'1" and 210, still swimming and biking, with some light lifting and rowing. BUT as you get older, and assume greater job responsibilities - i.e., work longer hours, however willingly - it can be very difficult to keep in shape, and it takes considerably longer to get back into it. Not that I'm retired, I'm looking to get back to 210, at least, and see where I can go from there. It's slow going, but I am making progress and am confident I'll meet my goal, though it's sometimes frustrating to accept just how long it's taking.