Ran this today; the party did just about as well as possible, skipping all the combats they could and it ran in 5.5 hours. This was expected in a high-tier game, but making a note here in case it helps others with scheduling.
I'd also recommend GMs take careful note about fleeing thresholds, as I made a mistake on the first combat and it lasted a bit longer than it should. (I would love to see this on the statblock page somewhere!)
Page 8 wrote:
If the group earns at least as many Truce Points as half the number of PCs (rounded down)
THANK YOU for this!