Two hours for this adventure is definately not enough time. I did play it several times (with different characters) and ran it at least once as well. There are a few situations/traps in here that are particularly nasty and I got the impression some of them were there just to seriously mess up high-level characters whose players were pushing to try and get through this in a two-hour slot.
It is a sequal to the Against The Giants adveture in The Yawning Portal (although having gone through that adventure first is not a requirement) and a prequel to the AL Season 6 epic, DDEP06-03. If you do not have a chance to play DDEP06-03, there's a high likelihood of this module ending on a disappointing note, which is kind of a sad way to end a tier 4 module, especially if it's the one that gets you to level 20.
That all being said, it is an intersting romp through an old ruin and there are some potentialy cool Story Awards/Downtime Activities in here.