Not a code issue and I doubt the usage exceeds a family with a bunch of kids if this is really a couple loads a day. If my sister's experience is any indication (5 kids)a Kenmore/Whirlpool will do several loads a day for over a decade.
Definitely not an NEC code issue. We just install the receptacle and make sure it is to code. If the customer plugs in the wrong appliance for the application it is between them and the building inspector.
Speedy Petey
"Anyone who has never made a mistake has never tried anything new." -Albert Einstein