Release a 16 person 4 hour long dungeon

[Rydin]

I think it should after a few months to give hardcores a long term goal, from reading this a 4hr dungeon would mainly be the hardcores anyway so they would not complain, if you want the best of the best gear you need the time sinks imo.

A 4 hour dungeon... 3 times a week for 2 months... I'd do it...
What should be the difficulty level of the dungeon in relation to the ones we have now?
on par with AV/CC? harder?