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I don't know the 'official' method but I've had them at least two weeks with no problems. I love onions though so they're lucky if they're around that long.
If I'm not going to use the chopped ones within a few days I freeze them. They freeze pretty well actually.
I'd say up to 6 months, stored properly (cool, dark place but not in the fridge). My mom keeps food from the garden, old school.
You can also dice it and freeze it. In the fridge, diced, I'd only give it 3-4 days.
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