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Re:Paul Graham To Hold Y Combinator “Office Hours” At TechCr... by nostromo on Wednesday May 18, 2011 @01:47AM (#2559191)
A big portion of the article answers this question.
Re:Paul Graham To Hold Y Combinator “Office Hours” At TechCr... by alagu on Wednesday May 18, 2011 @02:11AM (#2559233)
A more detailed explanation of office hours in pg's 'At YC' article - http://ycombinator.com/atyc.html