The Cat is Out of the Bag?

[savaughn]

The WOW experience bar has 20 units, and from my experience, it takes about 25-30 minutes per unit after character level (clvl) 50 if you don't do any quests and if the monsters you're grinding are between clvl-4 and clvl+2. You also need a short break every hour or two, so that it takes somewhere between 10-12 hours of constant grinding to make one level-up after clvl 50.
If the WOW expansion actually introduces 10 additional levels up to clvl 70, these should be some sort of "master/hero levels" that take about 100-120 hours per level, and that ANY expansion item, incl. greens and blues, that has a level requirement of 61+ is soulbound.
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I don't think you can make any kind of generalization like this. If you're sitting with full rest state, working with the right character combinations, and fighting against the right mobs you can eat through exp like no one's business. When you're out of rest state, fighting the wrong mobs with the wrong character combinations, you can play all day and go nowhere.

For example, I can say with absolute certainty that if you have two hunters and a druid and you are killing elites in Winterspring, you can get from level 59 to 60 in just under three hours if you have some rest state going into it.