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The Furlong/Firkin/Fortnight (FFF) system is a set of units that uses impractical and outdated measurements. It is a humorous system of units and is not used in practice. These units are mainly used jokingly in computer science, notably the microfortnight.# One millifortnight is equal to about 20 minutes.# One millifurlong is about 8 inches (7.92).# One decafurlong is 2.01168 kilometers.# One centifirkin is slightly less than 1 pound (.90202).# One microfortnight is equal to approximately 1.2096 seconds * One furlong per fortnight is very nearly 1 centimetre per minute (to within 1 part in 400). Indeed, if the inch were defined as 2.54 cm rather than 2.54 cm exactly, it would be 1 cm/min. * Besides having the meaning of "any obscure unit", furlongs per fortnight have also served frequently in the classroom as an example on how to reduce a unit's fraction. * The speed of light may be expressed as being roughly 1.8 terafurlongs per fortnight. * Five furlongs are approximately one kilometer. * The city of Chicago's street numbering system allots a measure of 800 address units to each mile. Logically, streets were subsequently laid out 8 to the mile. This means that every block in a typical Chicago neighborhood (in either North/South or East/West direction but rarely both) is approximately one furlong in length.