Elf bars are a special type of snack made by elves for elves, and they are designed to provide a quick energy boost when needed. The bars are usually made from a combination of nuts, seeds, and dried fruit, with a hint of honey or maple syrup for sweetness. The bars are packed with nutrients and vitamins, making them an excellent source of fuel for elves. As for how long an elf bar lasts, it depends on the ingredients used and how it is stored. The bars are usually made fresh and consumed within a few days, but they can last longer when stored in a cool, dry place.