sentence to a 3 year's imprisonment

These are OK:

• There is a 3-month probation.
  
• sentenced to a 3-month probation / imprisonment --sentenced to 3 months' probation / imprisonment
• He is on a 3-month probation --He is on 3 months' probation
  

So follow this grammar, It is a 10-minutes meeting.=It is 10 minutes' meeting. right, teacher?

No.

It is a 10-minute meeting = It is 10 minutes' meeting

understand that, thanks so much.

In my opinion:

It's a 10-minute meeting.
It's 10 minutes' meeting.
It's a 10 minutes' meeting.
It's a meeting of 10 minutes.

CB

Someone needs to help me.

It was a 10-minute meeting sounds totally normal.

What is the context for It's 10 minutes' meeting or It's a 10 minutes' meeting? Those don't sound normal at all! So I'm missing something.

It's a meeting of 10 minutes sounds grammatical, but not natural. But my mind doesn't rebel against it like the two above.

I agree with you, Barb. My ear rebels against "It's 10 minutes' meeting".

I think the construction in question is most common in (to the point of being nearly exclusive to) expressions such as "in 10 mintues' time" or "in 3 months' time". And even then, I think it sounds more British than American.

Grammar GeekWhat is the context for It's 10 minutes' meeting or It's a 10 minutes' meeting? Those don't sound normal at all! So I'm missing something.

It's a meeting of 10 minutes sounds grammatical, but not natural. But my mind doesn't rebel against it like the two above.

Hi GG

I was concentrating more on the g

I also believe it should be a It is a 10 minutes' meeting.

However, I believe Mister Micawber inadvertently left out the article.

I still find "It is a 10 minutes' meeting" odd. And I still think the most common usage of this construction (when talking about time) is with the word 'time'.