Ok hopefully this is not a repost!
Just wanted to share a good "spot".
My english is horrible sorry^^.
1.So you take the Quest: Act 2 - Quest 2 - Leutnant Vachem(thats how he is called in my language) [DO NOT TAKE THE Quest Begining!!]
2. Push Start and run into the circle, take the location with the hourglass
3. Arrived you go up towards the 2 guards....just do the Quest^^
4. Skip ALL DIALOG with SPACE (you dont have to wait ; ) )
5. Go Downstairs, skip dialog, kill snakes, open cage, skip dialog
6. as skipping dialog run towards the exit
7. outside: Skip dialog, kill monsters
8. Quest finished, dont talk with the guy...logout-------> rinse and repeat!
I did this in 1:30 min(1 complete row) and got 27k xp at level 40
= 60/1.5= 40 -> 40*27000 = 1,08 mil xp/h
hopefully you like : )