Aerobic exercise is with oxygen and it is faster than any types of normal exercise. Burning fat is one of the prime necessity for the exerciser. It is essential to perform the exercise in certain time limit to burn fat in the specific time limit. If you increase the time limit from 20 minute to 30 minute than the fat burning ratio will change. Over all it depends on your individual fitness to select the exercise time and set the target for burning the fat. If you are more keen to burn the fat than it is ideal to use more calories than you intake it.
Moderate exercise is equalize the cardiovascular position and needs to be performing for 30 to 45 minutes. Fat burning is associated heart rate. If you are increase the heart rate to 75 percent than your fat burning ratio will be half to one gram per minute. The aerobic exercise also based on the weight. If you are over weight than the fat burning ratio will be less than the normal level. It is essential to get the proper treatment on time to get the advantage.