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When stored at room temperature, butter can stay good for approximately 1-2 days. This depends upon the ambient temperature in your home and whether the butter is kept in a sealed environment. Butter with salt will generally last slightly longer than unsalted butter. This is because salt inhibits bacteria from growing.
In the refrigerator, salted butter can be expected to last anywhere from 3-4 months, and unsalted butter can last anywhere from 1-3 months. The primary reason for the difference in shelf life between salted and unsalted butter is that salt acts as a preservative. Salt retards the growth of bacteria. This in turn increases the shelf life of butter in both the refrigerator and at room temperature.
When butter is frozen, the shelf life is greatly extended. Frozen butter can remain in good condition for 6-12 months when properly wrapped. I have taken advantage of
