Here in Brazil it's very common to have several showers a day. I, for example, take two. The first is when I wake up, before I go to work, and the second is when I get home from work. I wake up at 6.30am and get home at 8pm.
Interesting. Swimming pools also have pipes that cycle water. And ideally you are keeping the water maintained and doing regular deep cleans of the tub anyways