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General kitchen guidelines suggest:
Salted butter: Can sit out for several days to about a week when kept covered in a cool, clean environment.
Unsalted butter: Best to leave out only what you will use within a day or two because it has no added protection against spoilage.
Whipped or flavored butters: These should stay refrigerated unless freshly made and used immediately, since added ingredients may spoil faster.
If your kitchen regularly gets warm (above typical room temperatures), refrigeration is the safer choice.
The Best Ways to Store Butter on the Counter
