I think it should, but some thing it doesn't. So, should I be typing '2 days' a week' because it's possibly missing the word 'of' or should it be without the apostrophe?
com/forum/threads/255159-Does-days-a-week-need-an-apostrophe .
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Answered https://www.usingenglish.com/forum/threads/255159-Does-days-a-week-need-an-apostrophe.