I'm not a T.G.I.F. guy. I get off a plane at 2 o'clock in the morning and I'm looking for my secretary because I want to know what's going on.
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At the very end of a book I can manage to work for longer stretches but mostly making stuff up for three hours that's enough. I can't do any more. At the end of the day I might tinker with my morning's work and maybe write some again. But I think three hours is fine.