When you evacuate an attraction, how long should it take?

The 911 tape for the heavily reported on Harry Potter and the Forbidden Journey evacuation has been released . On it, one of the ride’s passengers claims they had been kept waiting 15 minutes in an uncomfortable position without any notice from ride attendants when help would come. Leaving aside how accurate the 15 minute claim was, I think the incident poses an interesting question to consider

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When you evacuate an attraction, how long should it take?