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Sentence examples for know how long from inspiring English sources

"Know how long" is correct and usable in written English.
It is used to ask how much time is required for something. For example, "Do you know how long it will take to finish this project?".

Exact(60)

Sewell needs to know how long.

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The New Yorker

I don't know how long.

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The New Yorker

You don't know how long you'll live.

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The New York Times

I don't know how long it lasted.

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The New Yorker

"I don't know how long that lasts.

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The New York Times

"I don't know how long I'll compete.

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The New York Times - Sports

You don't know how long it is.

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The New York Times - Sports

I don't know how long it was.

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The Guardian - Sport

He didn't know how long it took.

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The New Yorker

"You know how long you'd like it?

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The New Yorker

I don't know how long 'temporary' could be.

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The New York Times
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Most frequent sentences:

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