Christmas tree lights typically come in a variety of lengths, ranging from 6 feet to 40 feet. The length of the light strands will depend on the size of your Christmas tree and the amount of coverage you want. Generally, a shorter strand is suitable for smaller trees, while a longer strand is needed for larger trees. Additionally, some strands feature end-to-end connections that allow you to connect multiple strands together to create longer runs. Ultimately, the length of the Christmas tree lights you need will depend on your specific needs and preferences.