The lifespan of a Christmas tree varies depending on the type of tree and how it is cared for. In general, most types of Christmas trees can last for up to 8 weeks if they are properly maintained and kept in the right environment. Some species of Christmas trees, such as fir trees, can last even longer if they are properly cared for. Additionally, the lifespan of a Christmas tree can also depend on how often it is watered and how often it is exposed to sunlight or heat.