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Butter can be safely stored at room temperature for a long time, as it is low in carbohydrates and proteins that bacteria thrive on. However, while safe, leaving butter out can affect its flavor within a few hours, so it is recommended to return unused butter to the refrigerator within 4 hours to prevent it from becoming rancid. To soften butter for baking or spreading, cut it into small chunks and let it stand at room temperature for about 15 minutes, or grate frozen butter as a quick fix.
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