Yeah, laundry does take time. I take plenty shortcuts, and it still takes longer than I want it to. Just one of thoes things.
I add Vanish liquid/powder to the washing powder instead of spraying.
I find it does the same as the spray, but it’s quicker.
If the stains don’t come out, I add a bit of bleach to the next wash (only for *all whites*, of course)
Also, it’s worth making sure they change shirts daily. Less black and easier to clean.