Currently we have to kill 6 shissar each having around 90 m hp.
They do zero damage (indeed a very modest 6000/sec), so for tanks and healer encounter is : OK afk 3mn -> push auto attack.
BTW: To make mob interesting give them some stone skin DR each 20%, and give them a decent DPS, high enough to be dangerous for a DPS .... indeed it should be high enough to kill a dps class that would not use roots or stuns etc ...