series of long-distance  triathlon  races organized by the  World Triathlon Corporation  (WTC) consisting of a 2.4-mile (3.86 km)  swim , a 112-mile (180.25 km)  bike  and a  marathon  42.195-kilometre (26.219 mi)  run , raced in that order and without a break. Most Ironman events have a strict time limit of 17 hours to complete