The author of a book called "The 4-Hour Workweek" has acquired an executive fan base that includes Netscape founder Marc Andreessen and venture capitalist Tim Draper. His advice boils down to ditching the unnecessary. "You need to emotionally condition yourself to the point where you're comfortable declining almost everything," says Timothy Ferriss. Start, he says, by doing an "80/20 analysis" on your time and revenue.

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