Which exact items are you washing every week?
I took a day of annual leave yesterday to do some tidying and deep cleaning whilst DS was in nursery and did a full change of our bedding which involved 2 laundry loads with pre-soaking both in some Vanish beforehand:
1 x coloured duvet cover
4 x coloured pillow cases
1 x white sheet
1 x white mattress protector
4 x white under pillow cases
It took the best part of a day to get through everything and that was with quite warm weather so everything could dry on the line.
Do people who wash their bedding every week do all of this or are you just doing some items weekly and the rest less frequently?