Can i suggest a timer that the boss mob stays there until it despawns? Perhaps like 30 mins or an hour? As it is now it if you can't kill the monster it will stay there causing solo players or weaker ones to lose the hunting spot.
There's no need for this. All the bosses that can really tie up a spot can be killed by 2 basic mages.
If anyone needs help clearing out some of the boss spawns just send me a PM, I'm not interested in any of the loot from them and I know exactly how annoying it can be when they tie up a spawn.
I can vouche for Deacon's contribution to such efforts. He has done this for several people, myself included and is always straight forward, just and honest.