I wash most things at 40 because I know that things don't get properly clean at 30 (either in the visible sense or the invisible sense).
Towels and bedding at 60 or 90, depending on how much time I have.
Most things get dry on an airer in between 12 & 24 hours. Nothing ever smells. But I am very particular about how things go on the airer. Everything must be shaken out so it has as few creases as possible, and be laid on the airer so that it is completely flat with no bunches or folds. I also try to alternate bigger things (t-shirts, leggings etc) with small things (pants, socks) on the next 'line'.
Anything I can hang up instead (jumpers, skirts, dresses, hoodies, cardigans etc) gets hung on hangers and hung over upstairs doorframes. They're always dry the next day.
Shirts, school trousers, jeans, towels and sheets get tumble dried, guilt-free, if it's too wet/cold to hang them outside. I don't iron. Saving the environment, bit by bit.