I do a wash of clothes every day. There’s 4 of us - me, 2 adult sized teens, and a pre teen.
Dcs have a clean set of school uniform/PE kit each day. I have 3 sets of uniform, and one pe kit per child. Ds wears full pe kit all day Monday, and needs it again on Wednesday, so that gets washed on Monday night (tracksuit, skins, shorts, top and hoodie - that’s about 1/3 of a load on its own). Since I’m washing that anyway, I put in the dds’ uniform from that day, along with my clothes from the day before.
Dd2 wears pe kit all day Tuesday, and needs it again on Thursday. So her kit gets washed on Tuesday evening, and since the washer is going on, ds and dd1’s uniform goes in, and again my clothes from the day before.
Wednesday I get the day off from uniform/kit washing as dc go to their dad’s, so I do a load of sheets/duvet covers. Usually one week it’s dd1 and ds (both single beds), and the following week it’s dd2’s (double bed).
Thursday it’s back to washing school uniforms and my clothes from the past couple of days.
Friday it’s swim kit and bits of pe kit that need doing - ds has to have kit in school every day, and they do pe/games each day, so there’s always bits needing washed. Plus the dds’ uniform to get me ready for Monday.
Over the weekend we all wear clothes, so that’s another wash, plus my bedding or a load of towels.
So that’s 7 loads each week, without particularly stretching it, or running a half empty machine etc. I would generally do an extra wash each week - towels, or cleaning cloths, or washable sanpro as there’s 3 of us using that too.
Easily 8 loads a week.