About 50 to a 100 for touching up. Unless the paint used is from the same supplier protong has, try to minimise the area that will be fixed, otherwise you might end up with a noticeable colour difference. I had my Persona's rear bumper touched up at one point where they re-sprayed quite a huge portion to "reduce the colour difference" and I didn't like it one bit because it was noticeably lighter than the rest of the car.