So, some railroad is required for this module.
The investigation the players will do will not be relevant enough to the next chapters in the game (unless you run Option C - without them being captured), so do hurry through these, as the fights further ahead may take up significant amounts of time.
By the end of 1 hour, you should try to get the PC's into the ambush battle, and move on with the rest, as there are still 2 significantly large fights aside from it. Pacing is key, but it can be a fun module on the combat side of things.
Do get creative about the Bell platform, as most STR characters may be able to jump from their initial platform to the center platform.
[3 of 5 Stars!]