If the interior is new, a quick vacuum and basic cleaning can do the job. However, if the vehicle has suffered a lot of wear and tear, a full cleaning will take between 5 and 8 hours to return to being new. Detailing the car takes between 2.5 and 10 hours, depending on the retailer, the cleaning of your car, and the wash package you choose. Quality retailers take 5-10 hours, while a quantity retailer requires 2.5 hours or less to get the job done.
A detail will last 4 to 8 weeks. It may seem a bit, but remember that professional detailing services are incredibly thorough; a retailer will complete all of your car's exterior panels, interior and windows in one go. The time it takes to do so will depend on the condition of the interior, but if you're like me and tend to keep track of dirt inside, it shouldn't add too much time to your maintenance wash.