Our traditional day is typically because the day after our Thanksgiving is a holiday, too. Not all, but most people get off both the Thursday and Friday. Since they have that extra day for family, they take advantage of it.
The decoration take down day varies though, many do it on January 1, others wait until the weekend after New Years. But I know some have specific dates, too.
It feels like Christmas lasts longer these days as shops have had displays for a while. I know they want to sell stuff, but at home I think a week of decorations is plenty. Just call me Scrooge.