A real Christmas tree typically lasts for about two to four weeks, depending on the type of tree and how well it is cared for. Some trees can last longer if they are properly watered and kept in a cool, dry place. To keep your Christmas tree fresh for as long as possible, make sure to keep it away from direct sunlight and heat sources, and water it regularly. Additionally, if you notice that the needles are starting to fall off, it's a sign that the tree is starting to dry out, and it may be time to replace it.