If you're gonna read everything, there's... at least 4 hours of dialogue/plot + maybe 2 hours on combat and puzzles. Depends on one's pace of course.
The bulk of it is finally recruiting The Hell for the dragon raid, which of course means doing several tasks for them. The final one is in a new location and takes several hours, including some non-sleepwalking combat. Then you get another wind charge for the Staff from that location.
There's a relatively short optional quest regarding the Elven embassy with a sneaking minigame that's triggered from the nightclub, look for a pair of guys in bottom right corner. At least I think that's new in v10.
And there's a lengthy chat with the Oracle that progresses events from Cape Hope, but you have to figure out a new portal puzzle to get there - and it's actually a bastard-tough one, kid gloves off. Triggered via Shiri.
Finally, one (1) sex scene (singular). But it's another threesome with Ana and Val, so whatever, it's good.