What is correct : 72 hour or 72 hours? In a article I have seen 72 hour rather than 72 hours.


"72 hours" is correct, unless it precedes and modifies another word, as in the example of, "There was a 72-hour gap in the security footage," in which case it is hyphenated for clarity.

Not the answer you're looking for? Browse other questions tagged or ask your own question.