Very interesting module with nice mechanics and options for the DM and players.
This module "can" be run in 2hr but you have to make choices between RP and combat.
First part : fast track the RP and run it more as a cinematic
Second part : run only one of the four available encounters if you are in a rush
Third part : nice RP, can be run as a cinematic to save time
Fourth part : very very nice surprise hahah, there is a great Empire Strikes Back reference here so it made me (and my players) very happy
In general, finish the end of fights as cinematic when like after killing the boss there are 2-3 zombies remaining. Have the flee or be killed be players (just ask a player : "so describe me how you kill those remaining critters")
If your players prefer RP, go RP all the way in 1st and 3rd part, if they prefer combat, run them as cinematic (but save time in the fight by ending them even there are still monsters remaining but it is obvious that the big part of the challenge of the fight is overcome)