Talk:Raid Battle/@comment-66.162.60.190-20150414174545

Just went alone and took out Bruzebia. After 5 minutes the server updated the mision as done. I started fighting the boss again during that period.

My guess, it takes around 5-7 minuts to update server. If you kill the boss again in that time, the timer starts again. So killing the boss multiple times just causes the timer to get rest and the quest to never complete.