how long is furlong
A furlong is a measure of distance in imperial units and U.S. customary units. It is equal to one-eighth of a mile or 660 feet or 201.168 metres. Distances for thoroughbred horse races in the United Kingdom, Ireland and the United States are still given in miles and furlongs (example), but the unit is otherwise no longer in common use. A furlong is exactly one eighth of a mile. It is also: 660 feet. 201.168 metres. The name furlong originally referred to the length of the furrow in one acre of a medieval ploughed open field. It was a 'furrow long'.