Once a week or sometimes once a fortnight.

idk

It depends on how hot or cold it is. Usually once every 1-2 weeks.

At least once per week. I change my pillow cases daily.

Put em in the shower with me every morning

Not often enough

2 week. I can't sleep in filth😊

Every couple weeks or whenever my cat throws up on my bed 😺

every weekend, sometimes more - something about getting into those fresh warm sheets that is life-affirming

I don't wash it myself, but it's about once every 1.5 weeks

Depends.. when I am longer at my primary home in Belgium I might manage to do this each second week or 3rd.

Probably not often enough