Right,
Regulation to certify an aircraft capable of evacuation of a full load of passengers is usually carried out under test conditions where company employees (familiar with aircraft) participate in the test. The company offers the first 1/3rd of pax (employees) off the aircraft a $100 bill to ensure they make a darn good job of it and get as near to 90secs as humanly possible.
Tell you what, sometimes on my aircraft it takes pax 30 mins to get off after a ULR flight! If I landed and they had to evacuate, I would guess 5 mins would be good going.. pax have shoes off, they put them back on, they grab their belongings, 3 mins to me is very good going!