In 1982 the 20.30 AF to to Paris was the last flight out of T2. With cabin baggage you could check in on the gate 20 minutes before flight time, no checks prior. My dad used to aim to drop me at the terminal Sunday evening 30 minutes before departure. From memory it was a scheduled 1 hour but usually much quicker. There was an Air Cameroon (I think) flight arrived at the next gate in Paris around the same time. If they landed first, immigration took longer than the rest of the journey combined. Beat them and I was in bed in the 7th arrondisement by midnight.