The lifespan of a live Christmas tree depends on a few factors, such as the species of tree and the care it receives. On average, a live Christmas tree can last anywhere from 2 to 4 weeks, but with proper care and attention, it can last even longer. To ensure your live Christmas tree lasts as long as possible, keep it well watered, avoid placing it in direct sunlight or near a heat source, and make sure it is placed in a cool, moist environment.