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May 15, 2013. The USDA says that butter is safe at room temperature, but if left out for several days may get a rancid flavor. They recommend leaving butter out for only a day or two. For more food safety information, see Smart Storage Strategies and Can Your Refrigerator Kill You?
Best Answer: Buttercream made with milk can sit out for three days at room temp. Buttercream made with heavy cream needs to be refrigerated. With no air conditioning, you'll need to put the cake in the fridge. The air conditioner doesn't just cool down the air, it also removes humidity from the air. Too much humidity will make your buttercream sag or fall off the cake.