How many calories do you loose by roller skating for 5 hours?

It really depends on a number of factors. There are thinks such as body weight, normalcy (how often you do it), the speed at which you go, and general physical condition that all tie into how many callories you burn. For the avg. person weighting around 150lbs, averaging 10 mph it would be a little more than 500 calories per hour. Someone who weighs about 120lbs would only burn about 300 calories and someone who weighs 200lbs would burn about 650.