@Jill2 You live in a place that's sunny and warm a lot of the time, as I do. I don't have back-to-back guests and it's too hot here 75% of the year to even use a duvet, so it doesn't get used that much. I wash it once a season (that would be after about 3 months of sporatic guests) but I'll often shake it out and hang it in the sun for a day to freshen up. And of course, if someone spilled something or had some kind of accident on the duvet, I'd wash it then.