Ours goes up the first weekend of Advent, usually Thanksgiving weekend, and stays up until Epiphany, Jan 6. Once in a while, I put away the other decorations and tree before Epiphany, but never our nativities. When I was growing up, we never put out the wisemen until Epiphany, so, we kept the nativities up even longer. I have one special nativity that never gets put away, actually. It is on display in the living room all of the time.