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Even in those days, this was incredibly rude! Giving the President of your country only seventeen days'' notice before making a speech, especially as he wasn’t top of the bill, would be unthinkable today! So, the day arrived, and Everett, well prepared, displayed his oratorical skills in a speech which lasted over two hours. Lincoln, on the other hand, spoke for just over two minutes.
https://www.lingq.com/el/lesson/lesson-28-the-gettysburg-address-431424/

I guess there is a mistake in the above context. It should be seventeen day's notice, not seventeen days notice, but I am not sure. Am I right or not?

marked as duplicate by J.R. Aug 5 at 19:38

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You're right that it's a typo, but the corrected version is not what you think.

Seventeen days is a plural noun. Therefore, the possessive apostrophe goes after the s:

seventeen days' notice


Only if it were a singular noun would the apostrophe go before an added s:

one day's notice

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