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I have a question about the usage of “in”.
Let’s say you take upon a task in which you have 24 hours to do it.

Let’s say you complete It, and it takes you 8 hours to do it.

Could you say: “I did x in 24 hours.” And be correct? Or can you not, And can only say “...in 8 hours.”

”In” = “Within”?

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Julian Ng-Thow-HingLet’s say you take up a task for which you have 24 hours to do it.Let’s say you complete it, and it takes you 8 hours to do it. Could you say: “I did it in 24 hours.” And be correct?

Yes, you can, but it would be more natural to say 'I did it in eight hours — well within the allotted 24.'