While answering this question can be very complex, we understand the average time by an installing dealer for window tinting of cars is from 45 minutes to 2-3 hours. The time taken actually depends on the number of windows the customer wants to get filmed. In case the car owner wants to add window film to the back window and all four side windows, the process will take longer, whereas if the customer wants only the front side doors of his car tinted, it takes considerably less time. Some installing dealers want to keep the car for a day or at least 12 hours to ensure proper drying of some high-technology window films.