I have a friend who had two dishwashers built in when he remodeled his kitchen. He said it was so he would never have to empty the dishwasher again. He just takes clean dishes out of one to use as needed, then deposits them into the other dishwasher after he eats off them, until it’s time to run the new one. Then he does the same thing with the now-cleaned dishwasher.
I like how your friend thinks!