I think there are some. I know some people who go home around 5:15, every day. I'm not entirely sure when they get in, but I think it's around 9:00, +- 15 minutes.

I've been working pretty consistent 8 hour days lately, noon to 8. Granted, in my last project, I was often working 11-12 hour days + weekends. I think that's only typical if you're on a high profile project with a company-wide push to get it out the door, though. There are 20,000 Googlers; most of them are not on such projects.