How long is one furlong? (an imperial unit of distance)

A furlong is a measure of distance in imperial units equal to one-eighth of a mile, equivalent to 660 feet, 220 yards, 40 rods, or 10 chains. It has very limited use, with the notable exception of horse racing in most English-speaking countries, including the United Kingdom, Ireland, Canada, and the United States. Furlongs are also used in conjunction with miles to indicate distances on highway signs in Myanmar.