Usually once a day, but twice or thrice during the summer during band camp if necessary. I am profoundly intolerant of people who do not shower at least once a day. In fact, one of my roommates showers at night instead of in the morning like me and the other roommate, and I consider even that to be very objectionable because if we go out to eat for lunch or dinner, he'll smell, because I hate to say it folks, but your body doesn't magically stop sweating or producing body oils and odors during the night. So yeah, in my opinion, it's rude (especially in a professional environment) to not shower and put on deodorant in the morning.