man hour(n = noun.time) person hour - a time unit used in industry for measuring work;
is a kind of 60 minutes, hour, hr
is a part of workday, working day

   The quantity of work which one person can perform in one hour; -- often an estimate made for the purpose of deciding whether to undertake a project, and sometimes used in accounting; as, it will take a hundred man-hours to write the program. [PJC]

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