A Christmas tree can last anywhere from a few days to a few weeks without water, depending on various factors such as the type of tree, its age, and the environment in which it is placed. However, it is important to provide your Christmas tree with water regularly to ensure that it stays healthy and vibrant. Without proper care, your tree can become dry and brittle, leading to a decrease in the quality of its appearance and a shorter lifespan. So make sure to keep your tree well-watered and cared for to enjoy it for as long as possible!