There is no definitive answer to this question as it depends on a number of factors, including the type of dish being washed, the size and complexity of the dish, the number of dishes being washed at once, and the efficiency of the dishwasher. Generally speaking, however, most simple dishes should take no more than a few minutes to wash in a dishwasher. More complex dishes may take longer, and it is always best to consult the manufacturer's instructions to ensure that the dishwasher is being used correctly.