English
man-month
Compound of man + month, although, as with any such unit of measure (e.g., pack-years, newton metres), the mathematical relationship of multiplication is simultaneously involved: X men working during Y months = X × Y = Z man-months.
The story
Compound of man + month, although, as with any such unit of measure (e.g., pack-years, newton metres), the mathematical relationship of multiplication is simultaneously involved: X men working during Y months = X × Y = Z man-months.
Today it means
noun One person's working time for a month, or the equivalent, used as a measure of how much work or labor is required or consumed to perform some task.
Language periods are conventional ranges, not dates for this word.
Etymograph / man-month