Longman Dictionary of Contemporary English
man-year
noun
EXAMPLES FROM CORPUS
▪ But before the advent of data-processing capacity, the actual analyses would have taken man-years of clerical toil to complete.
▪ Typical applications are found in companies with several medium-sized projects, i.e. ranging from one half to five man-years.
Wiktionary
man-year
n. One person's working time for a year, or the equivalent, used as a measure of how much work or labor is required or consumed to perform some task.
Usage examples of "man-year".
Without remorse, without a twinge of emotion of any kind, the screen lays bare the insights gained from man-years of research by highly educated, gifted scientists and the cunning application of that research by extraordinarily talented engineers.
Failure of any sub-system to function after touch-down could destroy human lives, not to mention billions of dollars worth of apparatus and tens of thousands of man-years of labor.
I had to make sure that what I did would be so hard to trace that Wallis wouldn’t assign the necessary man-years to the task.