Edit: Williamdclt, I'll answer your question here due to rate-limiting.
Yes, lots of us do; I've been working that way since internships in high school. Same with many others I know. Usually, though, it's close to 12 hours a day and none on Saturday, or maybe 11 a day and a little on the weekend. Not an issue so long as you plan about an hour a day for something fun and mindless, and leave weekends free to do chores/relax.
Edit: Consz, responding here due to rate-limiting.
Not all of us live in the same world. I'm glad to hear you and your friends are doing well, but that's not representative of everyone. I do because I'm currently hourly, and that's true of many of the people I mentioned. When every additional hour worked has more money associated with it, most people will work more; that's not silly. The downside is, of course, there's a distinct opportunity cost to taking time off, so I don't do so much of that.