Once you have had the exterior of your vehicle detailed, it is worth having the wax layer topped up, or a sealant applied to the wax finish in order to maintain the finish/look. Depending on the vehicles usage this could be within a few days, or a few weeks. A typical routine of maintenance could be (depending on vehicle usage); 1) Full detail every 6 months 2) Wash and wax every month 3) Weekly wash, and quick detail (using some form of Quick Detailer)