When I was growing up, our family tradition was to put the tree up 10 days before Christmas and then take it down on December 31st. (My dad was very superstitious, so the tree had to come down before the 1st.)
However, I was sitting here this morning thinking about taking the tree down today. My living room is so tiny that the tree is squished into a little corner...and while it's up the bunnies can't go in that room, even though the tree is artificial; they could easily get under the sofa and chew on the extension cord that is set up for the tree lights. Besides, it's only me and the animals here for Christmas this year, so I guess I just don't really care one way or the other about having the tree up.