And to make
coal... 
 You find a old swamp, and cover it for few million years ... 
  I
don't believe it takes quite that long. 
  It takes even longer. 
 
It has taken even longer, which is not quite the same thing.  Do we
have any reason to think we know how long it actually takes?  That is,
the time actually required, as opposed to the time taken in the cases
we've looked at?
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