Kept sealed in an airtight container, this Whipped Cranberry Butter should last for a good week in the fridge! But be aware, y’all, that it might not taste quite as good past the first 3 days. When you’re ready to use it, let it come to room temperature before serving so you can spread it easily.  Alternatively, you can add a dollop of oil (like canola or something similarly flavorless) into the butter when you make it, and it should stay spreadable even after you pull it from the fridge. Of course, this may affect the texture of the butter a bit, so use oil with caution!