Like others said, the most important thing is to have a good team and a keyer. I was in a 5 man team of three 137's, one 135, and me (lvl 110). The keyer was slow and the others would just bicker at each other. It was an f28 5:5 C6 Large and it took us a little bit more than 2 hours. It isn't about having a high lvl team cause that was a load of BS.