If the decorations are strictly Christmas related they will come down the weekend after the first. I normally keep everything up til on or around Jan 6th. Dont know where I came up with that date but this year it does fall on the weekend.
If it is winter related then I will keep it up til Valentines day. I dont really decorate for that holiday but it seems like a good time to start thinking about spring.
Hallelujah! Holy S***! Where's the Tylenol?