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Use "man-hours" in a sentence
"One consequence of whipping was the loss of untold numbers of man-hours."
"A policy-making authority would only have to look at the man-hours expended by detectives who are attempting to trace weapons to see thelogic."
"In fact, I have somewhere seen figures that suggest there are at least as many man-hours of non-teaching teachers (advisors, administrators, seconded teachers, teacher-teachers, careers advisors, psychotherapist types etc.) as man-hours of classroom teachers - without even adding-in the managers. wrt."