All 6 is easy and faster if your team is good. Did the 1 orb last night with some randoms and it was so stupid. The hardest part of doing 6 is cursed thrall, so you have 2 gaze holders they break their respective orbs between switching gaze back and forth, and 4 dps ppl on the bottom, one person occasionally clears adds then continues to shoot. We usually kill golgoroth in 2 goes, that's like 6 minutes.