EDIT: If this is the wrong section, please direct to the right one as I am new here
So with Winter Vacation coming up, I figure that some of you are going to try to hardcore level alts/your main, and would of course like to do that as fast as possible. Well, I found one guide that leveled me very fast:
80-81: 2 Hours
81-82: 3 Hours
82-83: 4 Hours
83-84: 5 Hours (I really didn't like uldum so I had some afk time)
84-85: 4 Hours
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Total: 16 Hours
This guide was developed by a beta tester and avid wow player who took months to make the optimal and fastest route for leveling. Link to the Download: Guide
P.S: He has guides from 1-80 as well.