Grammar Geek wrote: If you use it before a noun, use the hyphens. Afterward, there will be a ten minutes question-and-answer session. Hi GG Afterward, there will be (a) ten minutes' question-and-answer session. Afterward, there will be a

However, in quantitative expressions of the following type there is possible variation: a ten day absence a ten-day absence a ten days absence a ten days' absence With temporal nouns in the plural, the apostrophe is sometimes

Hello Mara This is not an answer to your question. This is just a comment on the question you raised. All of what you are asking is exactly the things that have annoyed me long time since I began studying English. Some native speakers grudge that