My linkshell just did the mission last night, we were 7 people and had a lv71 WAR escort through the tower. One death in total because the guy got surprised by the NM spawning while the others were still fighting a giant. Meh. I raised him and we continued the mission.
Took us about 2 hours in total, I'd say. Found the mission kinda hard cause there are a LOT of enemies in the tower and most of them aggro, especially bats.