The Ironman Triathlon competition has an overall time limit of 17 hours, with cut-off times applied to each of the race's three individual course components. Racers may complete each segment of the race on their own time as long as their overall time limit does not exceed 17 hours, though the cut-off times mean that the swim, bike and foot race courses will close down after a certain period of time.
An Ironman Triathlon begins with a 2.4-mile swim, which must be completed within 2 hours and 20 minutes of the race start time. This is followed by a 112-mile bike ride; this part of the course closes 10 hours and 30 minutes after the official start of the race. The third segment, a 26.2-mile run, must be completed before the 17-hour time limit.