My mistake then, thanks for clearing that up. That's pretty insane to be honest still, 12.2 million to burn in 23 seconds...
With 6 dps, 2 healers and 2 tanks, that's ~80k dps each dps. I'm still going to say that's bugged because Ultraxion had a 45k requirement, I don't see how they can push it higher than that without the help of some form of encounter buff (I don't know what the fight revolves around btw, if you get buffs for it).