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Re:Jack Dorsey does 8 hours at Twitter, 8 hours at Square daily by jinushaun on Monday November 14, 2011 @10:51AM (#3234406)
Doable if you don't have a family or care to hang out with friends. The key is really to work with your friends so work doesn't feel like work.
Re:Jack Dorsey does 8 hours at Twitter, 8 hours at Square daily by _delirium on Monday November 14, 2011 @12:05PM (#3234723)
There's also significant variation (apparently biological) in how much sleep per night people need. If you're one of the people who can get by fine with 5 hrs/night of sleep, you have almost 20% more awake time over someone who needs 8 hrs/night to maintain the same alertness.

(You can also try to modify it via caffeine or other drugs. I'm not sure I'd recommend it, but apparently many of the people historically known for their superhuman workhours were heavy amphetamine users--- Winston Churchill, Ayn Rand, Paul Erdős.)