24-hour notice or 24 hours' notice or 24 hours notice

[likesEnglish]

Hello,

Which one is correct?

1) Please provide at least 24-hour notice.
2) Please provide at least 24-hours notice.
3) Please provide at least 24 hours' notice.

Thank you for your help!

 

[Rover_KE]

3) is correct.

Rover

 

[freezeframe]

You can say "Please provide at least a 24-hour notice".

 

[Rover_KE]

You can say "Please provide at least a 24-hour notice".

That wouldn't be colloquial in BE.

Rover

 

[Soup]

Hello,

Which one is correct?

The last two are fine.

1) Please provide at least 24-hour notice. :cross:
2) Please provide at least 24-hours notice. :tick:
3) Please provide at least 24 hours' notice. :tick: