But the rules for your Elf on the Shelf aren’t as hard and fast as you might think. And, technically, you can choose when your elf returns to the, ahem, North Pole. But no one keeps their elf around past Christmas Day, so when is the best time to finally say goodbye to the Elf on the Shelf for the year?
Source: https://www.distractify.com/p/when-does-the-elf-on-the-shelf-leave