How often do you change everyone's bedding?
Do you have extra linen or just one set for each bed?
Do you hang the bedding to dry or use a tumble dryer?
I used to do it every week (or more often if necessary) but when DH became a full time student and we had to pay for laundry (not to mention the queueing) I started to do all of the bedding once every two weeks. I don't think I have managed to change 'everyone's ' every week since.
I do have a spare set for everyone but almost found it easier when I had to wash, dry and replace the only set in one day.