The daily exercise time should be determined according to personal circumstances. Generally speaking, if the purpose is to gain muscle, the daily exercise time should be about 40-60 minutes, and if the purpose is to lose weight, it should be controlled within 30-40 minutes.

The length of fitness time should also be determined according to an individual's age, gender, work nature and physical condition, and a targeted physical fitness test should be conducted to determine the most appropriate exercise time and intensity.

In short, the daily fitness time should be arranged reasonably, and the exercise effect should be given full play, while paying attention to the health and safety of the body.