The 5000-metre run (about 3.1 miles or 16,404 feet) is a popular long-distance running event in track and field. It is a track event in the Olympic Games and the World Athletics Championships that is raced over 12.5 laps on a standard track. The distance was first contested at the 1912 Stockholm Olympics when it was won by American Charles Billick in an unofficial time of 59:43.6. It was made an official event two years later at the Barcelona Games. A person who rows this distance is called a "rower". There are various methods for measuring the distance of a race between two points. One method is to estimate the length of a mile by multiplying the number of strokes made in rowing's equivalent of a full circle by 2.78. This gives a figure that can be divided by 12 to get the total distance in meters or miles. A second method uses timing lights placed at regular intervals around the course. The time taken to cover the distance in meters is then divided by 10 for estimated miles. Although there are other ways to measure distance in athletics, these two figures are used by most organizations conducting races beyond 100 metres. In terms of hours, a rower covers about 25 kilometres (16 miles) in under three hours. To put this into context, the average human male can walk approximately 15 km (9 miles) before he needs to rest, while the average female can walk about 11 km (7 miles).