When Google was a young company, she worked 130 hours per week and often slept at her desk. "For my first five years at Google, I pulled an all-nighter every week," Mayer said in a recent talk at New York's 92Y cultural center. "It was a lot of hard work." Source: http://www.entrepreneur.com/blog/223723
Wow, a great contribution to a company.
I'd think that a company that needs to perform at the highest level should do so with smart people giving their best hours and resting appropriately so they can be sharp.
The number of hours is irrelevant. Great people are great because their contributions are of great value, not because they contribute mediocre work three times as much as everybody else.