All the time, to be honest. I find myself reading way too much at work, instead of doing other things (grading papers, proctoring a test efficiently, etc.) I read at home, at the gym (and sometimes skimp on running to do inclined treadmill or bike just so I can read) and even when I'm in a car with others driving. Hell, I read during a board game meetup the other day (it was at a bookstore!) because I was close to finishing one (yes, I do realize how rude it was, and didn't read except while waiting to start up a new game).
I read at night mostly though, and it's a nice way to wind down before bed. During the summer, while I'm off, I'll also walk and read as well. I generally don't tend to pass of social events to read, though (boardgame night was an exception because I had, like, 20 pages left), so that cuts me down some.
