Yup, even with my story the very first start-up I worked at wasn't that bad with the hours. We had the occasional crunch time, sure, but I rarely worked more than 8 hours a day. It really depends on management style, the stage of the start-up, and how technical management is (the less technical the more customer promises and more hours for employees to work, in my experience, because they don't entirely understand what is or isn't doable in a specific timeframe and burn-out is a lot harder to explain to someone non-technical).