Usually before school, and after school/evenings. Sometimes if I don't want to do work in my engineering classes, I shrink the IE window so it looks like I'm working, and read through A.net.
On average, I probably visit about 4 times a day (some visits are short though, just to check the news ticker, and the topics toward the top of the boards, usually the Civil, Hobby, and nonAV forums)
Work Hard. Fly Right. Continental Airlines