You can do it in one day easy, its just annoying having to jack the car up and do each calliper. Just sand paper it good to get any dust off. Primer it, then 2 coats of paint. What i then did was get a very hard roller painter thing. White paint, and rolled it lightly on the nissan many times so now i got Red Callipers with Nissan in White. Took some time, but looks sweet.
sorry for the dirty wheels