I don't know about you, but I could keep my Christmas decorations up all year.
But after a certain amount of time, people might start to wonder if you know what month it is.
I limit myself to leaving everything up through the first week of January - since that's when the Boy Scouts come to pick up the tree (thank goodness for that time constraint or else St. Patrick's Day would be my next reasonable excuse).
My mantel will be pretty bare after the nutcrackers et al. have to be packed up - looks like I'll just have to go shopping… bummer.
How long do you keep your Holiday decorations up? Are you sad or happy to see it go?