QUICK - Help needed with apostrophe in "5 years' time"

[HaventSleptForAYear]

Is that right?

5 years' time

I am doing the song tomorrow with a class (lots of good tenses in there) I teach English to and want to be sure before they all learn the phrase off by heart.

Thanks

Tis right.

Yes indeed, that's right.

The time duration is "of five years", so belonging to that (plural) mass of five years.

Analogy: one day's notice vs thirty days' notice

That's right but be prepared for alot of people to tell you it's wrong. It's a massive bugbear of mine!

Phew!

Don't think any of my students will be telling me it's wrong!

I have not seen the song title with an apostrophe in it though.

Feeling relieved that my students don't have a totally useless EFL teacher!

Thank you all.

Have double-checked my lyrics and found another missing apostrophe so I think I can finally print it out now!

Good night!