Blackink
There are 3 of us in my household but our 'towel regime' sounds like yours.
I.am astonished at the colour coded towel people, let alone the daily washing ones !!!. Though I am slightly envious of the organisational skills of the former - colour coding towels never occurred to me. Daily washing seems beyond bonkers to me though.
Daily changing of sheets is one step further along the incomprehensible scale to me. Changing my king size fitted sheet, duvet cover and 4 pillows case takes me me around 15 mins or so if you include the time to put it in the wash and get hang up to dry , iron put away etc.
In a week that is an hour and a half of extra work, let alone the amount of waste of energy ( mine and the environment). I'd rather spend that time doing anything else, though I appreciate, I.dont mind sleeping on two week old sheets (which is how often I change mine). When I was younger it was more like every couple.of.months!!