I thought I was going to have "a lot of free time" in my master's program, but it really doesn't work out that way. All my other grad school friends tried to warn me, but I didn't listen.

In school you're busy 24/7: doing schoolwork, worrying about schoolwork, or procrastinating on schoolwork. At least when I was working full-time, I would leave the office at 5-ish and not worry about work for 16 hours.