Thats what I thought till I actually tried it...
Durring the game I can make 6k exp easy off the pyrefiends.
And I am in a clan and I usually get on the winning side, so 3 zeals.
I am 64 str now so 1 zeal is 3150 exp
Each game is 20 mins, and 3 min in between, so in 1 hour and 9 mins i get...