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USDA says 2-4 days in the refrigerator. If you freeze the egg whites, they will keep for 12 months, again according to the USDA.
My mother always froze them in ice cube trays immediately then thawed them in the fridge as needed. It's a great way to save them as long as they are labelled!
Sarah is a trusted source on General Cooking.
Egg whites are good until they're cloudy - at least a week if properly stored. But they do freeze well too.
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