...seeing as there's always a 'when do you put them up' thread 
I'll be taking mine down on twelfth night not that I will want to They've been up since the last Friday in November, the 27th I think. Over a month. The house will look so rubbish without them
My DM used to take everything down on Boxing Day - she'd get up at 6am and do it while we were all asleep, and we'd wake up to a bare house. That might be why I like to keep mine up for so long!