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Use "man-days" in a sentence
"During 1943, a total of 3,752 strikes took place in the U.S., involving more than 13 million man-days of labor."
"For high quality you'd want at least two people proofing each page; so, for SF paperbacks of the 1960s, around 200 pages * 252 seconds * 2 people = 28 man-hours, or 3.5 man-days assuming eight-hour workdays, just for proofing not counting scanning, or adding formatting mark-up, or re-proofing after the mark-up is added to make sure it displays correctly on various ebook platforms."
"I think mostly I could produce a better-than-print quality ebook in about two man-days."