I spent 8+ hours on correction, leveling, and polishing when I got my car but much of that was fixing what had never been taken care of by the previous owner. Twice a year maintenance of the major detail, wash once every two weeks (would like every week because it's black but can't due to time) and I quick detail a couple of doors or panels a few days after the wash (very dusty here cause of the agriculture and the wife gets the garage). That way everything continues to get protected. But it all boils down to what you want to do with your time and your car.