20 Hours A Day

when focusing on building a venture, until you exit, put in 20 hours a day. 4 hours is enough to sleep. successful companies are built on putting in 20 hours of smart strategy daily. basically, be productive.

via how to be a wolf.

I cannot see why you can be productive with just 4 hours of sleep.
Maybe it is just me, I need 7 hours and by the way Real Men Go To Sleep.