The number of dishwashers a restaurant needs depends on several factors, including the restaurant's layout, menu complexity, operational efficiency, and the availability of staff. As a general guideline, you typically need one dishwasher for every 60 to 80 seats in a restaurant.
In your case, with 68 seats, a casual to fine restaurant would usually require at least one dishwasher. However, some restaurants may choose to have two dishwashers to handle peak periods, ensure smooth operations, and accommodate larger parties or events.
Keep in mind that this is a rough estimate, and the actual number of dishwashers required may vary based on the restaurant's specific needs and the speed at which dishes are used and returned during service. The restaurant's management should carefully assess their workflow and make a decision based on their observations and experience.