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This question already has an answer here:

Which of the two sentences below is correct?

  • (i) Three hours is a long time.
  • (ii) Three hours are a long time.

marked as duplicate by Nathaniel, user140086, choster, Hellion, Sven Yargs Jan 15 '16 at 4:36

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  • I'm not sure but i think the first one is more correct, because three hours is seems a single entity. – Amir Pashazadeh Jan 13 '16 at 3:13
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As a matter of convention, we often treat time, money, distance, or weight as a single measurement.

So, three hours is a long time. About 10% of the US is Muslim. So, as a matter of habit, I might say that 3.3 million of the US is Muslim. But I might also say 3.3 million US citizens are Muslims.

(And by the way, the California lottery jackpot this week is $1.4 billion!)

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