A rumored runtime for Avengers: Infinity War indicates the film will be the longest entry in the MCU to date.
If this is true, it means Infinity War will be the longest MCU installment so far, topping Captain America: Civil War by three minutes.
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Infinity War has long been billed as the culmination of the MCU to date, looking to pay off every arc from the previous 18 movies in what should be a cinematic event like no other.