We normally "de-Christmas" during the New Year's break, but there are quite a few people in my neighborhood (San Jose, CA) who leave at least some of their holiday lights up year-round! I suspect some of them are just lazy, but we do have quite a few families from India, and decorating with lights seems to come quite naturally for them. They have "Diwali" (festival of lights) every fall, but here they leave the lights up for months and some never take them down. I love it!
Gary