Our tree will come down sometime after Twelfth Night. We don't usually put it up until the weekend before Christmas, and I am a sucker for multicolored lights, so I like to leave it up as long as possible; some years there have been more needles on the floor than on the tree by the time we take it down, LOL. Now that we have an artificial tree, who KNOWS when it'll come down??
Lights... right now there's about 18" of snow in my front yard, so it's kinda hard to get to the outdoor trees to take down the decorations. We have icicle lights on the porch; I leave those up all year round. I love their colors and the warm, soft glow they give as we are walking in from the driveway or town in the evening. I love sitting out under the colors in the summer, as day turns to dusk and then darkness sets in, but my lights still bathe everything in colors. So... the decorations in the trees will come down when we can get to them, and the lights on the porch will come down when they burn out- to be replaced by new ones!