How many hours does it take to swim?

Personally, it should be no more than 2 hours. Soaking in water for too long will hurt your skin because there is bleach in it. Besides, there are many people in public swimming pools, and bacteria are inevitable. The longer it takes, the more it will breed. If you go to the seaside, it should be no problem after a long time. But not more than three hours. Just my personal experience. You can experience it.