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"I decided to go on holiday for a week. I think 10 days is too many for me."

Am I correct using 'is' instead of 'are'? Or the only way is to change the phrase to '10-days period is too long for me?'

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It's not ungrammatical, but it is unnatural.

Consider the more natural "ten days is too long for me".

"Ten days" is conceptualised there as a single abstact entity, hence singular "is".

BillJ
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  • Do I understand you right that though the word 'period' is only implied, it's correct to say 'ten days is too long'? – Artyom Lugovoy Dec 26 '15 at 13:05
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    @Артём Луговой Yes, "ten days is too long" is perfectly natural, I can assure you. – BillJ Dec 26 '15 at 13:08