Civvy
During the pre-movement time, it is unlikely that conditions will have reached flashover. Once they do, there will still be at least 15 minutes before a titchy wee flame is sustained on the safe side of the door, even without intumescent strips. By the time the strip blows, the occupants of the hotel will have checked into another hotel, had a 3 course meal, gone to bed, engaged in unbridled passion and fallen asleep, by which time they will probably have lost interest in the situation at their previous hotel, which, if located in London will be floating down the Thames aided by the discharge of 35 lines of hose discharged by the Messys.
With regards to the princess and myself strange as it may seem,I haven't the faintest idea what type of detectors were in the bedrooms of the hotel in question as taking an interest in that was not on my priority list.
As always, hope this helps with your CPD.