I zipped through 25 bounties last night at the summoning pit takes about 7 mins tops. You have to speed run to make it quick. In around 2-2.5 hours I was done with all 25 bounties. But as I got closer to the 25th one the game started to throw multiple wizards at me...they kept spawning at me from the entrance door for the summoning pit...it got so annoying that I had to complete the last two of 25 on the nexus.