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A post says

Part 1 questions are often familiar and easy so you don’t have to give a long and difficult answer, just range from 1 to 3 sentences for length.

I understand the meaning of the sentence, I just want to know the usage of "for length". It seems to be a grammar pattern. If it is, are there others, such as "for time", "for weight"?

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It's rather unidiomatic to say it like this.

just use 1 to 3 sentences.

would be much shorter and clearer. I wouldn't trust a website about learning English when it's writing sentences like this one and the one you mentioned here: Are "there are" and "there have" interchangeable? which clearly has a grammatical error.

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