Did you use ZAIO or ZFX? If you did then yeah expect at least 6 months. Use Z7 inbetween and more importantly as you dry your vehicle try a spritz of Z6 diluted 50/50 with water. This will keep your finish nice and free of contaminants allowing for better durabilty. Southern states are really hard on waxes and sealants, but Zaino has a melting temp of something like 650F compared to low 100's with a wax. There are a lot of variables with durabilty like Pat said, but I can easily say that nothing outlasts Zaino. Z7 is one of the stronger washes available, it has great lubricity and is very advisable when your car is dirty. However, if you are just doing a light dust wash, you might want to pick up a milder soap if you are worried about durabilty. QEW and TOL Bubble Bath are two very mild soaps, but you will have to strip QEW if you want to Zainofy your car again, becasue it has a wax. I use these three soaps exclusively with Zaino, and mostly I use Z7.