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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?
up vote 25 down vote. It depends on the room temperature where you live. At 65F (18C) or below, butter is often barely spreadable and will last for weeks on the counter in a sealed container. At 80F (26C), it starts to get overly soft and doesn't last more than several days.s long as you use salted butter it will keep in a covered container at room temperature for at least 2-3 weeks without getting mouldy or rancid, in my experience.