Forty minutes. By June 2022 15, according to the third part of the book "Guide to Family Fitness for Epidemic Prevention and Control": Exercise time, generally speaking, the whole family exercise lasts 60-90 minutes, and the overall exercise time is divided into the following suggestions: warm-up activities 10- 15 minutes, and main activities 40-60 minutes. The duration of aerobic exercise should be [20-30] minutes each time, and the exercise time of strength training varies according to the practice items and the number of groups, but it should not exceed 40 minutes.