Your dish washer probably has a "turbidity sensor". This is an infrared sensor that checks the condition of the water and adjusts your wash cycle accordingly. There is probably build up on the sensor (especially if you have hard water) and this is causing it to run so long. The easiest fix for this is to run a cleaning cycle on the dishwasher. Start your empty dish washer on a heavy wash cycle and wait for it to start filling with water. As soon as it starts to fill, open the door and pour 1/2 gallon of white vinegar into the bottom of the unit. Close the door and let it run its cycle. At the end of the cycle, run a second cycle and see if things improved. If things still are not better, you may have a bad sensor. If you have more questions, write me back. Hope this helps!
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