When I started commuting regularly it took a while for my weight to start dropping. I like to ride fast, so I was gaining muscle at about the same rate that I was burning off the fat. My belt was getting longer but my weight wasn't budging. I think it was 3 months before the muscle gain leveled off and my weight started coming down. I'm 23lbs lighter now than when I started. I'd be happy if I could loose about 5 more.