The 90 sec during cert is to demonstrate that that the aircraft can be evacuated in 90 sec by the average passenger.
What happens in real life is up to the passenger and crew.
In the subject incident I would certainly want to take enough time to reduce the chance of injury to myself.
Of course I woud rather not be evacuated down the chutes at all but that's a crew call. I have been aboard an aircraft that did have a wheel fire and while deplaning normally watched the fire trucks spray the wheel.