The only business activity available is to do laundry, but sims won't wait for them or try to dry them. They will literally put clothing in the washing machine and leave the business a few moments la...
Ideas
Fun fact: This was already so in Sims 3 laundromats. It seems impossible to code the whole washing process for NPCs. Perhaps turning off free will may help?
They can introduce new business activities as "dry clothes" "take out clothes from dryer" to help alleviate this problem.