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Let's have a 5-minute(s) break.

He has 5 year(s) experience in gardening.

There is a 5 day(s) training on this topic.

Should the sentences above use the plural form?
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Comments  
To me they all are more like adjectives, so I'd suggest: a 5-minute break and so on.
Yes, and

a five-year experience ...
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However, 'five years experience' search on Google gives a lot of hits compared to "five year experience".

Engineering help wanted adds with three to five years experience range were common not long ago. Today because of laws against outright age discrimination ...

Have 16 Years Experience in the field of Personnel & Administration in various ...

"How am I supposed to have 3-5 years experience if nobody will give me a chance?"
I think you have to type

'five years' experience' and 'a five-year experience'
These look like compound nouns.
5 minute break
basketball player
car park

There are exceptions where plural form is used. Nouns that are only used in the plural, or have the different meaning in singular/plural or countable/uncountable
clothes shop
glasses case
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I think it should be like so:
New2grammarHowever, 'five years experience' search on Google gives a lot of hits compared to "five year experience".

Engineering help wanted adds with three to five years of experience range were common not long ago. Today because of laws against outright age discrimination ...

Have 16 Years of Experience in the field of Personnel & Administration in various ...

"How am I supposed to have 3-5 years of experience if nobody will give me a chance?"
New2grammarLet's have a 5-minute(s) break.

He has 5 year(s) experience in gardening.

There is a 5 day(s) training on this topic.

Should the sentences above use the plural form?

Hi,

This is my take:

1-Let's have a 5-minute break.

2 -He has 5 years of accounting experience.

3 -There is a 5-day training on this topic.

When we use this type of compound adjectives, the rule of thumb is to use singular form.

My company is going to have a 3-day shutdown for plant maintenance.

X magazine is offering a free 6 -month trail subscription.

In # 1 and 3 there is no ‘s’ needed.

In # 2, the function of “5 years” is not an adjective but a noun, therefore ‘s’ is needed.

«However, 'five years experience' search on Google gives a lot of hits compared to "five year experience".»

You didn't note that a majority (~ 2/3) of those entries were with an apostrophe after "years":

«Five years' experience».

To me this phrase seems better thouth still a little strange.
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