man-year
From Longman Dictionary of Contemporary Englishman-yearˈman-year noun [countable] technical the amount of work done by one person in a year, used as a measurement The project will take five man-years to complete.Examples from the Corpusman-year• Typical applications are found in companies with several medium-sized projects, i.e. ranging from one half to five man-years.• But before the advent of data-processing capacity, the actual analyses would have taken man-years of clerical toil to complete.