Epics is way different than these bosses.
Its way different story when u go with main class 70+ which has Clan Wars and when u go to some AQ with 40 level sorceror and u cant kill a rb, because u cant kill enemies and everyone standing 3 h, shaking their right hand.
Imagine with every update all epic bosses get level up. Now we would have core, orfen and AQ 70-80 level. But no, we have to go with some twinks to kill 40 raid which drops valuable items. Its generally l2 korean logic.
I vote to put 22 h timer and like this they will rotate after 6 month.
And for people who think in eu prime nobody will kill it, dont make me laug.
Probably in CS also no people from eu to pvp with?
Also its a big chance for eu yo reach China in items.