My anecdotal evidence from the startup world, though, says that most people in a "startup" like Facebook work very hard and very long hours at the same time. I

My anecdotal evidence from the startup world, though, says that most people in a "startup" like Facebook work very hard and very long hours at the same time. I think your description is a very good way to work, but I sort of doubt that this is an accurate description of life at Facebook :P