Thinking more about how much time has passed for the PCs in the labyrinth, I definitely miscalculated. The baseline for the two combats are 6 second rounds. The first combat had only 3 rounds but the second combat had 6 rounds. That's a total of 54 seconds, which equals 54 minutes in Bluffside.
Plus, the PCs used several skills that take up time such as Bluff, Disable Device, Search, and Sense Motive.
Tuck does a search for traps after descending down the rope into the small entry room. The time displacement isn't as strong there as in the Golem Room and beyond. 1 second was only equal to 5 seconds in that room. Tuck searched six 5-ft squares, which takes 6 rounds.
(Once the secret door to the passageway was opened, time got weird in the guard post, but it wasn't noticeable with casual observation. 1 second became equal to 2 seconds in the guard post.)
Tuck made a Sense Motive (hunch) check to when he first saw the gargoyle golem, which takes a minute. So, that's a hour.
Tuck searched the choke point and part of the Golem Room for traps. That is, at least, thirty 5-ft. squares including the choke point and the first half of the room up to 10-ft beyond the gargoyle golem. The Search skill says that a character generally needs only to be within 10 ft. of a surface for it to be searched.
So, that's 30 rounds of searching, but...
He also had to make a separate Search check to look for footprints, which included searching not only the floor of the Golem Room but also the smaller entry room. So that is another 30 rounds for the Golem Room and 6 rounds for the entryway.
(Tuck also performed a Search check during the combat with the golem to find the trap. Since, it takes a full-round action to search a 5-ft.-by.5-ft. area, so it's not inconceivable that he successfully did this just as the fight was breaking out.)
For Falen's Disable Device check, it takes either a full-round action for simple devices or either 1d4 or 2d4 rounds for more complex devices. The trap definitely wasn't a simple device. It would require a roll of 2d4 rounds. Rolling...
Rounds it took for Falen to disable the trap: 1D4 = [4] = 4
Rounds it took for Falen to disable the trap: 2D4 = [2, 3] = 5
So that's 5 more minutes of time.
While Akos didn't make any Diplomacy checks when he first entered the Portal Room, he did make a Bluff check to conceal his gestures to the DMK, so Lowenan didn't see them.
Regardless, once the PCs entered the portal room and began interacting with the ex-guards, time would have flowed quickly back in Bluffside during the negotiations. I think saying that there has been at least 20 to 30 minutes of talking (outside of combat and other actions) wouldn't be pushing it too far. Let's go with 20 minutes. So, that's another 20 hours.
(Akos Diplomacy check to avoid combat is included in the time allotted for combat.)
That would be, roughly, 83 hours and 59 minutes or 3-1/2 days of time passing back in Bluffside.