Every single evening around the same time.. I can't remember a day in the last 20 years when I didn't, maybe except the 42-hour flight (with layovers) to Australia from the US, and a dozen or so 12+ flights, but it was the first thing I did when I go to the hostel, friend, etc..
Once or twice each day in the summer. In the winter 4 -5 times a week. My hair's so short I can clean my head, face and pits with a washcloth during the cold months.
I shower 2 or 3 times a day. Always in the morning, and when I get home from work and then usually before I go to bed.
We don't have a Shower but we bath every night. Me first then hubby. And yes sometimes in my water! If I haven't been shaving lol
Before a swim (because it's expected and requested), after any significant exercise, and before dressing in nice clothes. That means that I shower most days, but rarely more than once, unless it's a swimming day for me.
I used to shower everyday, especially when I had to go to an office. Now every two or three days. I found my skin and hair/scalp were being damaged more from the quality of water than showering every day. I only shampoo about every 4 days now. Living in California and Mexico, the water is very hard, mineralized, and full of nasty chemicals and poisons like arsenic and mercury. This can damage skin over many years, and it don't feel great either. I've forgotten what a soft water shower is like...
For me it used to be Daily. Then in my mid-twenties once a week or two. Now, about once every 2-3 days.