 If dishes were especially dirty, then the dishwasher would run for a longer time than if the sensor detected them to be clean.In this way, the dishwasher saves energy and water by only being in operation for as long as needed.Dishwashers that are installed into standard kitchen cabinets have a standard width and depth of 60 cm (Europe) or (US), and most dishwashers must be installed into a hole a minimum of 86 cm (Europe) or (US) tall.