My husband [the venture capital investor Zachary Bogue] runs a co-working office in San Francisco. He runs his company out of there and other startups cycle through. And if you go in on a Saturday afternoon, I can tell you which startups will succeed, without even knowing what they do. Being there on the weekend is a huge indicator of success, mostly because these companies just don’t happen. They happen because of really hard work.
This was actually the part I found most surprising and interesting. One the one hand, it's scary that you have to put in insanely long hours like that to succeed. But on the other hand, it's liberating knowing that one of the keys to success, is something everyone has access to.
If some random person had made the above comments, I would have laughed them off as an insane workaholic. But knowing that this advice is coming from someone's who's seen it first hand at early-stage-Google, and many other startups... it's hard to ignore it, no matter how much I may want to.