how long does elf on the shelf last

*Elf's face falls into a look of concern* You see, the elf on the shelf is not just an ordinary toy. It's a magical being, who can move around your home and keep an eye on you. But you must remember, the elf is only there to keep you on the right path. It is not meant to be used as a tool for punishment. So, to answer your question, the elf on the shelf can last as long as it takes for you to learn the true meaning of Christmas.