I was a competition swimmer as a kid and swam all the way through high school, quit in college when it screwed up my studies. I would typically shave for no more than two meets a year.
When shaving, watch your knees, easy to cut yourself. It typically takes a days to see real hair again, decent in a few weeks, 100% back to normal in a month or so. It feels really freaky at first. Personally, I can't stand it for much more than a few days. Hair all the way