Trying it atm, getting around 5k per Quest, reward grows with every lvl, shitty part is, you don't get ep when you die on the third one, what is pretty hard on lower lvl, I allways thought you get ep for quests even though you are dead...
Well, 3:30 per run when you are fast, thats pretty sweet though!
Just wanted to share a one leveling tip too. When you are in hell you can spam quest "The Doom in Wortham". (You need to take ferry to Wortham and kill Magda's Minions)
You will need gear or geared friend to boost it to you.
It takes max 2min complete this quests and it grants about 100k exp (Quest grants 63k exp and about 2k gold) and some loot, because you need kill this one champion pack every time.
Then tp and exit game and start it again
OT: Trying to test this in hell with my friend and see how fast it is.
I have been doing this for 3 days now, most effective farm my group has found in the game yet.
For those wondering:
Difficulty EXP Gained for both quests (if I remember correctly from doing them all about 700 times each).
Normal 12,500 x 2
Nightmare 44,000 x 2
Hell 105,000 x 2
Also the rare drop chance seems a lot higher in this area than in others and the gold income isn't half bad (once you factor in the AH as well). Oh and since Az is probably the easiest actual boss in the game its easily doable in Hell without relying on slow farming nightmare forever to get 60. You just have to watch the occasional Freeze Vortex Mortar/Molten mobs.
Even at level 59 running the hell difficulty one I was getting 1/5 of my full exp bar per run, making it damn efficient.
This is a bit off topic but a possible tip related to farming in the same area. I imagine doing loot runs in the Act 3 towers (specificly the Tower of Cursed ) is among the best place to farm bosses with the Nephalem Valor buff. If you take the WP to the Tower of Cursed level 1 and work your way down. There is usually 4-6 elite groups on the way down to the heart. The area is always laid out the same, very straight forward, relatively small, aswell it is big enough that you won't be fighting in too tight of close quarters. I'm not sure if the Mistress of Pain (think thats her name lol) mini boss is affected by Nephalem Valor or contributes to the buff but she is one of the easiest fights in the game anyways so it might be worth while to start the quest before 'Kill Azmodan'. I'm only on in the middle of Act 3 hell but this was the best spot I found for filling up your inventory fast in NM and imagine it is the same in hell/inferno especially with the MF buff.
The only problem I invision is that the mobs should all be around lvl 63 and you might need to be extremely well geared to farm this in Inferno mode consistantly.
Also, when you first take the Cursed Tower lvl 1 WP, a group of elites will sometimes spawn on the lower ledge right next to the WP. You can safely take this group down from the higher ledge using the gap to your advantage. Just watch out for Mortars/Vortex/Teleporting groups xD.