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I would like to know whether following sentence is correct:
The battery does not last for as long as it says on the label

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Yes it is, as Pitarou and Barrie have pointed out. Though your first sentence should have a definite article before following, i.e, whether the following sentence is correct. The following X is an idiom, and requires the. – John Lawler Mar 3 '12 at 16:12
People do sometimes use for so long as it says - possibly because, like you, they're not sure it's okay to repeat "as" in this way (their concerns are unfounded, obviously). – FumbleFingers Mar 4 '12 at 16:35

It offends no rule of English grammar.

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It’s fine. You can delete the word “for” if you want to.

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