Aion Riftshade

Does anyone know exactly how long an unlooted mob takes before disappearing?
And if there is a limit in how many mobs you can leave unlooted in the same area before they start disappearing? 
 

(farming repeatable quest and it’s much faster to kill a bunch, loot everything, and turn in several times in a row)

It varies, but for example in inggisson I knew from experience it's 5 minute