This suggests you are doing multiple loads back to back... Which in turn suggests you are either seperating whites and coloured clothes (no longer necessary with modern clothing, detergents and low temp wash cycles), or you are underfilling your machine (modern machines can wash about 20 lbs of clothes - 100 tshirts - in one go without wash quality degrading).
In my experience, separating whites (not only so they can be bleached when wanted) from darks from colors is definitely still necessary?
I actually turned a beige sweater that snuck into the wrong load beige-blue just yesterday with a pair of AG Jeans that have been washed every other week since I got them two years ago
3 kids and some foster animals, so I have normal full loads plus some stuff that really needs to be washed separately. On a normal day it's not a problem. But if anything happens that causes a washing backlog then it starts getting logistical and that's when the timer makes things harder. I don't separate whites except for my kids karate gear. My washing machine does 10kg which is 22lbs. I try to fill it where possible.
