Still Chrismas?

Here is the big question, when do you take the Christmas tree down? This is second to, when do you put the Christmas tree up? In this house the answer is whenever it feels too old, but that changes constantly. I have heard that a very select few don't even take it down and is a permanent decoration. This is only possible of course with the fake trees which is the leading form of Christmas tree for South Africa. But still the question stands when does Christmas end?