Which one is the correct form and why? Example sentence: x`

Katsumi has already lived in this twenty-four(-)hour KFC for two days.


Twenty-four-hour, because this is a compound adjective.

Compare it with the numeral, so that there's only one spot where you have to think about putting a hyphen, and the necessity should become clearer:

✗ Let's visit the 24 hour KFC.
✓ Let's visit the 24-hour KFC.

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