My wife and I pounded out 11 hours of the HOBBIT, boom just like that on too the next one. You want to know our secret? Just have a baby who won't ever sleep at night. Then you can just knock it out, my productivity went through the roof, for a day or two, until I could not function anymore. Imagine if you had 20 hours a day to do stuff. You might actually run out of stuff to do.
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From @bigram13