747Focal- your sums are not quite right. The slides will be double lane, so they will go off 2 by 2 like animals entering the Arc, not one at a time. 67 people per door, 33 pairs in 90 seconds- with their asses on fire? They'll get off! Better in the dark, can't see the drop.
I'm sure Airbus have done their sums, and I cannot see what is wrong.