I see 432 questions tagged short-connections. This made me wonder: which airport has the longest connection time?

Notes:

• Longest connection time = time it takes for a passenger to go from one flight to their connecting flight.

• I am interested in

  1. airside-only transits
  2. transits requiring to go through customs/immigrations
  3. transits requiring to pick up one's checked luggage.

  I understand this means that the question may therefore have 3 correct answers. It's that's too broad, I can post 3 questions.

• Assume the passenger is healthy (i.e., can walk fast with their carry-on bag) and has a French or US passport.

• I understand that the connection time partly depends on the arrival and departure terminals. I'm interested in the worst case scenario, since I am looking for an upper bound.

• Assume that the planes are on time.

• Assume that the arrival and departure planes are at same airport.

Motivation: getting upper bounds, i.e. if the answer is e.g. that the longest connection time for airside-only transits is 60 minutes, then I won't have to worry when I have airside-only transits scheduled for 60 minutes or more, regardless of the airport. For example, this question asked if 2 hours was enough for an airside-only transit, and the OP wouldn't have had to worry about it if they knew that the longest connection time for airside-only transits is 60 minutes (+ knew that airside-only transits are possible at that airport).