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Buttercream Frosting-Time Limit?

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If I were to make cupcakes today with buttercream frosting, how many days can I keep them out of the fridge without them going rancid on me?

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  1. I know people who don't refrigerate their butter at all (in cooler weather) and AFAIK they've never gotten rancid butter. It's my guess that your cupcakes would go stale long before your buttercream goes rancid.