Here :
C:\Server\gameserver\config
# % regeneration and defence for RaidBoss and their minions
RaidHpRegenMultiplier = 100
RaidMpRegenMultiplier = 100
RaidDefenceMultiplier = 300
# Minions respawn timer 300000 = 5 mins
RaidMinionRespawnTime = 300000 (edit that)