One month for the Z2, and at least 6 weeks for the z5. And it's still beeding water like nuts, still shines like a mofo, and while not quite that ultra smooth oily feel it had when initially done, it is definetly still nice and smooth. THat amazes me because it has rained here at least 5 days out of 7 for every week since I did the car last. No lie, rain, rain, rain, rain....arg. Finally getting some nice weather now, but I'm sick of rain. AI wanted to test the wax and all, but come on, enough is enough.