How long is an Ironman triathlon?

An Ironman triathlon is 140.6 miles long. This is considered an endurance event, and frequently takes competitors over 10 hours to complete. The triathlon consists of 3 events: swimming, biking, and running. The swim portion is 2.4 miles long; the bike segment is 112 miles long; and the run segment is 26.2 miles long.