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Whipped cream can be prepared up to 24 hours ahead of time if itâs kept refrigerated. Even then, it may start to separate after a while. The best way to keep it is by placing a fine-mesh strainer over a bowl and placing the cream on the strainer. That way, any liquid will leak into the bowl underneath.
FOOD STORAGE â HOW LONG CAN YOU KEEP... SOUR CREAM â UNOPENED PACKAGE. The exact answer to the question âHow long does an unopened package of sour cream last?â depends to a large extent on storage conditions â to maximize the shelf life of sour cream, keep it refrigerated at all times.