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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.
This site estimates the lifespan of a mid-range dishwasher as being approximately 10 years and having a cost of $500. That adds up to $50 per year. This report estimates that an average dishwasher runs 215 loads per year, so youâd have a cost of about $0.46 per load for the cost of the dishwasher.n average dinner could produce 20 â 40 minutes worth of dishes. If you are running hot water for the duration, at 3 gallons per minute, you could easily be paying $1.17 â $2.34 in hot water over the course of those 20 â 40 minutes.