Real Christmas trees can last for up to 6 weeks, depending on how they are cared for. To keep your tree fresh and fragrant, it's important to properly water it and to keep it away from heat sources such as fireplaces or heaters. You should also check the tree for any dry or dead branches and trim them as needed. Additionally, you should make sure to remove any ornaments that are too heavy or could break easily. Lastly, you should also dust your tree regularly to keep it clean and free of dust and debris.