@MisterT373 I heard about this yesterday, but we took all our decorations and lights and tree down on Sunday (3rd.) We had had them up since 21st November, (as did most people in our street,) so we were happy to take them down after 6 weeks.
We had a lot of lights up (outside, and a few inside,) and quite a few decorations, and our tree took us a couple of hours to decorate, as it's big, and has lots of decorations. So no way would we be putting everything back up!
What's more, the tree/decorations/lights have always come down by the epiphany (today - 6th January,) so I am not about to change it now.
That said, we do have 3 or 4 sets of battery fairy lights kicking about. So I may consider popping them on for 2 or 3 hours a night til February 2nd. 
But even next Christmas, we won't keep the vast majority of decorations and lights up any longer than the first week in January...
I suppose there's no harm in keeping them up til February 2nd if you want to though... Christmas has been ever-evolving for many years, and as someone said upthread, many people put them up in late November now, when back in 'days of yore' many people didn't put them up til Christmas Eve.
In fact, if my memory serves me well, when I was a small child, ours never went up til 24th December. Us kids would get up at 9am or so, and the tree and decorations (crepe paper streamers and balloons,) would be up! 
And we had those lovely fairy lights with little lampshades. And the fragile and breakable baubles!