Let's discuss it according to people. After exercise, my hair will sweat, but it is a bit troublesome to wash my hair long every day, and I feel that I can't wash it well every day (this seems controversial, but I don't think it is good to dry my hair at least every day, otherwise I will catch a cold if I don't blow it). Therefore, it depends on the amount of sweat and hair of each person under different conditions after exercise. It is best to wash it after half an hour of exercise.