How on earth have you missed the other 652,000,064 threads on this?????
Sheets - usually twice a week, sometimes more in summer, never less than once a week.
Mattress protector & under pillowcases probably every 2 weeks, sometimes more sometimes less but never, ever, less than monthly.
Towels - (not shared!!) a new one after roughly every 3rd use, but I usually shower at least twice a day. They are allowed to dry then are put in the 'dirty towel basket' and washed when there's enough of them - every few days.
Tea towels - they get done as a load on their own, we use loads of them, they are allowed to dry then get put in the 't-towel wash bag' and done on a hot wash, on their own, about once a week.
Dark wash
Medium wash
White wash
Whenever there's enough to do a load or if someone needs something.
Don't count how many loads. Just do them, it's not as if I have to take it down to the river to do it 