It's one thing to say there's no set hours, it's another thing entirely to be in a place where you're surrounded by workaholics and your performance is measured

It's one thing to say there's no set hours, it's another thing entirely to be in a place where you're surrounded by workaholics and your performance is measured on what you produce -- think about it: if you don't burn yourself at both ends, you'll be on the low end of productivity.