About 30 minutes of 26king or so. Taking turns. Got about 250k in coins aswell.
EDIT: Lol covered total, total is like 2.1mill. My buddy got about 5mill. He ahd like 75 ep, and I had 25. Still got decent loot at 0%. But we stopped soon after hitting 0.
My combat was 101, and I think it may work in f2p still, but the loot will be worth alot less of course-though you could get lucky and get a good corrupt item.