Why are NFL games so long?

Why are NFL games so long? Why does it take so long? The management of the clock in an NFL game is a key reason as to why a game takes so long to complete. Whenever there is a change in possession, the clock stops and sides change their personnel, alternating between their 11-man offensive and defensive units.

Why does it take so long? The management of the clock in an NFL game is a key reason as to why a game takes so long to complete. Whenever there is a change in possession, the clock stops and sides change their personnel, alternating between their 11-man offensive and defensive units.
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