How long does an upgrade to Yosemite take?

Upgrading from Mavericks, the system appears to be stuck. I'm on the screen with the apple logo and a progress bar. The bar has not moved in an hour and is about half way. This is the screen after the initial install progress screen when an estimated time was provided. There are no extra sounds from the HD indicating any processing.
how long does the process typically take?  Is there a way to stop it without totally fouling things? 
Thanks,
Anne

I Found another thread that had a resolution. Thank you SATopWater  for your suggested steps. That appear to be working for me.
This solved my question by SATopWater on Oct 17, 2014 12:41 PM
I'm not recommending this to anyone, just thought I'd report on what worked for me:
-  Let Yosemite upgrade sit at the white progress bar screen at 50% for 4 hours.
-  Once I was nearly positive it wasn't doing anything like writing to the hard drive...
-  Held power button for 10 seconds to turn computer off
-  Waited about 10 seconds again
-  Turned power on and held Command R  (It took about 3 minutes to boot)
-  Clicked on WI-Fi symbol on upper right and turned off Wi-Fi
-  Selected restart from the System menu option
-  Computer rebooted and finished the upgrade
I have since rebooted (twice to be sure) and run a few things and all seems fine at this point.
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