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.
It's not like I just have to go to Washington and go to the White House everyday and go to the same press conference at 10 in the morning and then be briefed at 4 in the afternoon and then get a story on at 6.
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I don't know any other lifestyle. I get up in the morning and I really do feel that the world is my oyster and I start that way the same as I would if I were preparing to write a song: put a blank piece of paper up on the piano and you go for it.