"30 day span", "30-day span", or "30 days span"

Question

As in, "for each 30-day span, a late fee will be charged." I think the hyphenated version looks best, but is there some sort of authoritative word on that in a style guide?

Barrie England · Answer

Style guides sometimes say different things. They are authoritative only for the people to whom they're addressed. That said, I don't see how anyone could object to 30-day span. The hyphen between 30 and span shows they are to be read together adjectivally, and the singular follows naturally from each.

Answered by Barrie England on February 7, 2021

"30 day span", "30-day span", or "30 days span"

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