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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.
Multiply the wattage of your dishwasher (most models fall in a range between 1,200 and 2,400 watts) by the number of hours you run it each day. Divide 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.For example, suppose your dishwasher is rated at 1,800 watts, you run it for two hours a day and your electricity rate is 13 cents.Multiply 1,800 by 2 to get 3,600 watt-hours, or 3.6 kilowatt-hours. Multiply this figure by 13 cents, resulting in 46.8 cents.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.