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I've drained the fat from a roasted duck, placed it in a closed container, saved it in the 'fridge, not quite sure how long it will last??

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Protip: If you're storing it in a recycled mayonnaise jar, don't put it beside the actual mayonnaise. –  Chris Cudmore Jan 9 '12 at 18:23
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3 Answers 3

The main concern is keeping it from going rancid which is due to oxidation and heat. If you keep it at the back of the fridge in a container that minimizes the amount of open space on top it will keep a long time.

You can also freeze it if you don't intend to use in the near future and don't want it taking up space in the refrigerator.

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+1 I normally freeze it and use it directly from the freezer. Even frozen it's so soft that I can easily slice off the amount I need with a sharp knife and put the rest back in the freezer again. –  Mark Seemann Jul 23 '10 at 8:40
    
+1 for freezer, we froze out last duck fat and used it some months later for roast potatoes. yum –  Hath Jul 23 '10 at 10:26
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Should last ages as the other posters have said. However make sure it's pure and doesn't have anything else from the duck in as that can go off earlier meaning you have to throw out the fat with it.

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At least 6 months, easily a year. You'll use it all up well before then or you don't deserve to own duck fat.

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