What the posted minimum actually measures
Airports publish a minimum connection time based on typical walking distances and processing time between specific gates or terminals, assuming an on-time arrival and no complications.
What it does not account for
A minimum connection time generally does not build in margin for a late inbound flight, an unusually long security or immigration line, or a traveler who is unfamiliar with the airport. It is a baseline, not a cushion.
When to deliberately book above the minimum
Unfamiliar airports, itineraries involving a terminal or airport change, winter travel through weather-prone hubs, and any trip where missing the connection would be costly in time all justify booking well above the stated minimum.
Questions people ask
Is a legally booked connection guaranteed to be physically possible?
It is designed to be possible under normal conditions, but "possible" and "comfortable" are different things, especially for travelers unfamiliar with the layout.
Does an airport ever change its minimum connection time?
Yes — these figures get revised as terminals are renovated, security processes change, or new gates open further from existing ones.