Running days
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RUNNING DAYS. In settling the lay days, (q.v.) or the days of demurrage, (q.v.) the contract sometimes specifies "running days;" by this expression is, in general, understood, that the days shall be reckoned like the days in a bill of exchange 1 Bell's Comm. 577, 5th ed.
A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.