Most dishwasher cycle time varies from 1.5 hrs to 4 hours depending on the cycle and soil level. It is not unusual if the cycle takes 2 or more hours. New dishwashers are more energy-efficient and quieter and their cleaning process is also improved so they take more time as compared to old dishwashers. They have inbuilt sensors which can vary their wash, rinse cycle, and even can change the temperature required to clean the dishes.