The lifespan of a real Christmas tree can vary depending on several factors, such as the species, care and maintenance, and environmental conditions. In general, a well-cared-for Christmas tree can last for several weeks, with proper watering, pruning, and protection from heat sources. However, some trees may not last as long due to disease, insect infestation, or other factors. It's important to research the type of tree you choose and ensure proper care for the best chance of longevity.