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Grothendieck was known to work 10-12 hours a day more or less 24/7 every day for the (something like) 25 years of his mathematical carrier. I think it's written in some memoirs of Cartier that this was one of the underlying reasons he decided to quite quit mathematics - he simply was too tired.

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Grothendieck was known to work 10-12 hours a day more or less 24/7 for the (something like) 25 years of his mathematical carrier. I think it's written in some memoirs of Cartier that this was one of the underlying reasons he decided to quite mathematics - he simply was too tired.