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Timing of N[ Factorial[4000000], 18]

How long does it take Mathematica 7 to compute
   N[ Factorial[4000000], 18]

With the old version of Mathematica I have it takes a very long time, 
and I was wondering if Mathematica 7 is much better.  You might ask why 
I wanted to do that.  Well I wanted to see how quickly Stirling's 
formula approaches  Factorial[n]  for large n.

     Ted Ersek

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