Kelly shift
 n.— «Under what is known as the “Kelly shift,” adopted by the Fire Department in 1969, firefighters worked a 27-day rotation consisting of one 24-hour shift, followed by 48 hours off. After repeating that cycle seven times, they got six days off in row.» —“Lawsuit leads to long, complicated legal battle” by Ed Kemmick Billings Gazette (Montana) Aug. 27, 2007. (source: Double-Tongued Dictionary)

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