Air France 340 and few other wodebodies were indeed evacuated in less than 90 sec live.
Close, but not quite 90 seconds. But given that several exits were, or quickly became, unusable due to fire, they did very well. From the TSB report into the Air France accident in Toronto:
Approximately two-thirds of the passengers evacuated via exit R4. The remainder evacuated via exits L1, R1, and R2, and a few evacuated at exits L2 and R3. It is estimated that the aircraft was evacuated in a little more than two minutes. A number of passengers took their carry-on baggage with them; in view of the urgency to egress rapidly because of the smoke in the cabin and the fire, this action presented a significant risk to safety.