The mission for me was only frustrating because we had a teammate who could not keep up and we tried many things like just getting to the boss room and letting him get there on his own and we also tried taking every step with him(babysitting him) but that made us lose a lot of time. But with a few tries he started to remember exactly what he was doing and we all got to the boss room with like 9:00 left. You just have to get familiar with it so you know what setups work and what enemies you focus on and what jumps you can skip.