Webmany people exercise for weight loss. A common question that’s asked is how long to sauna to lose weight. The weight loss that happens during a sauna session. Webyou can temporarily sweat off water weight in a toasty sauna, but aerobic exercise burns fat calories. Harvard medical school estimates that the average person loses about a. Webthey might help you burn a few more calories while exercising. One study in active men and women showed that wearing a sauna suit enhanced calorie expenditure.