If the interior is new, a quick vacuum and basic cleaning can do the job. However, if the vehicle has worn out a lot, a complete cleaning will take 5 to 8 hours to return to being new. There are also other factors to consider, such as the depth of the stains, whether it is a smoky vehicle or not, and the age of the vehicle. It depends on how broken the car is.
It takes about 15 hours over 2 days to do this. For a partial detail, you can spend as little as an hour or two in your car. In a few hours you could wash the outside and tidy up the inside. It's about transforming the car, using different cleaning products and finishing touches.