You need good cordination with party in order to clean every area as fast as possible.
Gather the bosses together to kill them faster is one of a kind.
Of course, using the harpoon on Lodos as soon as he approaches is mandatory to kill him faster enough.
Also, you just need to kill 3 bosses in the teleport section, so you can just split and go 2 vs bosses and then gather at the third.
Suction PB is a must, and if you have classes that can use mobbing skills like zondeel is even better.
Beside that, having TE for buffs and RA for weak bullet is always a good choice.
It's not an easy task, even if you have a full group of fully equipped people. But it's not impossible. Me and other friends just cleared it, but we needed to burn 5 triggers of trial and error before reaching the end, in order to achieve it