When I was growing up, the consensus was that decorations were taken down on twelfth night, i.e., tomorrow night, 5th January (before Epiphany on 6th).
The church I attended had a slightly different scheme: on Christmas Eve a Nativity scene with Holy Family, shepherds, animals, etc. was set up and was the focus for a carol service (mainly for children, in early evening). Then on January 6th (Epiphany) the shepherds and animals were removed and replaced with the Three Kings. These remained until Septuagesima (I think). (The date of Septuagesima varied with Easter but is normally in late January/early Feb and in any case it would have been dismantled before Candlemas (Feast of the Purification of BVM) on February 2nd.