Publicized time for process will depend on physical accessability. Access behind the car's grills and retaining clips behind screen(s) are less than favorable. Knuckles and fingers scraped and bloodied on radiators. Normal to large fingers and hands will not work. Specialized tools will be required to hold and pull retaining clips onto grills to secure screens - fingers alone will not work. A lot of time had been spent "magnet fishing" for clips falling down and in behind car's bumper/grill! However, when finally in place, the screens appear clean and professionally manufactured!