What's the relationship between calories consumed during weight loss and exercise time ... Some people say that it takes more than half an hour to burn fat, but some exercises, like skipping rope, seem to take half an hour. The calories consumed at the beginning of exercise are converted from carbohydrates in the body, and sweating discharges water and toxic waste in the body. After a certain period of exercise, it will also consume a part of protein, and exercise for more than 30 minutes will burn fat. Exercise is good. Hang in there, come on!