Christmas trees that are well-maintained and properly cared for can last for several weeks. The key to making a Christmas tree last as long as possible is to keep it well-hydrated. Be sure to keep the water level in the tree's base stand topped up at all times, and don't allow the tree to dry out. Additionally, keeping the tree away from sources of heat, such as fireplaces or radiators, will help it stay fresh longer. By following these simple tips, you can ensure that your Christmas tree will last throughout the entire holiday season.