Similar to Labour Constants and used on the American continent, the amount of man-hours which are consumed executing one unit of work activity. Man-hour rate = man-hours required for work / completed work quantity. Example: Excavation 0.125 mh/cy. The man-hour rate is related to the inverse of the production rate times the number of workers in the crew performing the work. Example: Excavation at 8 cy/day (8 hour day) with 2-man crew = 2 x 8 / 8 = 2 man-hours/cy.