Was not super difficult, just very long and very mana consuming, all the re-entries were for sp. The end bosses take forever and have over 100k hp each, had to recall for sp several times during that part.
The swim actualy was not that difficult, the traps do about 300 damage so I can take around 3 hits before dying. Reminded me of when I had to do the swim when I was running crucible on my TR at level, I though the traps would 1 shot me but they didn't.
All characters were logged off the entire time however I did have to log on my bard to get the levers in the maze and for the rune wheel, but besides that all characters were logged off the entire time until the end to loot in order to help with lag, scaling, and confusion. No named items were pulled, just a lot of relics.
Took around 90 minutes to complete (the quest completion said 8 minutes so it was bugged), however I am very confident that after some more runs I will be able to run it without problems in under 60 minutes (and perhaps even less, but I think do to the nature of the quest it will take at least 40-45 minutes a run on epic elite solo). This was my first run after-all.