Laundry question...

[fajrdrako]

How often do you wash your bed sheets?

I read somewhere that anyone with allergy problems should wash their sheets at least once per week. Since I broke my elbow, stripping the bed has been difficult, and making the bed even more so, so I want to do it as little as possible. Before then, I washed the sheets every Friday. Theoretically.

I don't use blankets, but a duvet, and I wash the duvet cover when I wash the sheet and pillowcases - about once per month. Assuming no soiling, spills, or stains, assuming no specific need to do it more often, what is a good average? I don't want to be a slob, but I don't want to be over-particular, either.

In the laundry room today I was chatting with a neighbour and asked him how often he washed his sheets. "Not as often as we probably should," he answered, which I expected, but then he said, "We wash our sheets about once a week. We used to do it every day, when we had a washer in our apartment."

Every day. Boy, does that make my housekeeping look bad.

On a Google search, I found this advice site, which seems to say that once a week or once a month are both pretty much all right, except in cases of bad allergies.

Answers.com says wash them every one to two weeks, period, and once a month is not enough.

Fynadvice says every two to three weeks.

Advice?