Hmm, that's a tricky one. Christmas lights are supposed to be long and stringy so that they can cover a lot of space and add to the overall Christmas atmosphere. If you want to shorten the length of the lights, you could try cutting them to size with a pair of wire cutters. However, make sure to be careful and only cut the lights at the designated spots where they can be safely shortened without damaging the wiring or the bulbs. Alternatively, you could also try looping the excess wires back on themselves to make the string of lights shorter.