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It is normal for some dishwashers to run for up to two hours or more under certain conditions and on certain models. 1  On select models, the timer display or dial will stop for long periods (up to 1/2 hour) during the wash and dry cycles while the heater is activated. On models featuring Auto Hot Start, the cycle may be extended up to 20 minutes while the dishwasher heats the water.
Many U.S. families can run a dishwasher for only a few dollars a week. Unlike gas pumps, appliances don't record consumption in precise dollar amounts. But you can use mathematics to figure out how much it costs to run your dishwasher.ivide this number by 1,000 to find the number of kilowatt-hours the dishwasher uses. Multiply this number by your cost per kilowatt-hour to come up with the daily cost of running your dishwasher.