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.
Since I've moved from a coast to a more inland city, a lot less. It sounds gross, but I'm down to once every other day. I don't sweat as much, my clothes don't stink as much, and I don't feel as 'swampy' as I used to. Also if I shower everyday here my skin goes bananas dry.