s/o Duvet covers - how often do you wash them?

Unless it is a very cold night, we just pull back the duvet and hang it off the bench at the end of our bed. I probably wash the covers every few months. I'm sure some Peas will be appalled, but seriously we hardly ever use the thing.

Me too, so weekly.

Me too, I'd never thought to use both. I wash mine once a week.

I use a top sheet, so I wash the duvet cover as often as needed. Cats get on the bed so I wash it if it gets furry.

We use a top sheet, blanket and a duvet. All bedding is washed weekly, except the blanket and duvet cover, which is probably every 2 weeks.

I can't stand a top sheet under a duvet. When I visit my parents the bed is made up with a top sheet and the thing nearly always acts like a snake and wraps itself around my feet by the next morning. I usually find that out when I attempt to get out of bed, then I remind myself how much I dislike top sheets and take the thing off.

So my duvet covers are washed every week.

We also use a top sheet and a blanket with our duvet. The cover is more decorative, so we don't have an all white bed. We wash it 3-4 times a year.

Ditto. 

My sheets get washed weekly, but the duvet cover goes in only when it's beginning to look like it needs a good wash.