We have loads. My mum really goes mad on Christmas.
We put them up usually on the 1st December (or the closest time to that when my mum has a day off), but my mum likes to be the first to put them up. This year, however, she's seen two houses with their decorations up already. So we're putting them up on the 30th November instead! Far too early.
We always take them down on the 2nd January, because it's usually the last day my mum has off, and as much as she's itching to put them up, she's had enough of them and the mess by a week and wants them gone.
I also help my nan put hers up. We go to Dublin each year near Christmas to visit my uncle and she puts them up a week before then. This year, that's this weekend, so I'll go round to help her. Like my mum, she takes them down on the 2nd or the 3rd.

