Beno, as Neil says, Collinite 476s should be lasting a long long time. I got a genuine 6 months of very prominent beading on both my cars, used daily in the winter grime, parked outside too. I don't add more than 2 layers either.
You don't need a machine, or to warm the wax (even in the dead of winter) just a foam applicator pad. Put it flat into the tin, twist with a little pressure, then put it on the panel and move the applicator in small tight circles. You'll be able to see the wax on the panel, and it will go a long way before you need to reload the pad. Once you've done the whole car, it should be very easy to buff off, pretty much one wipe if you've applied it thin enough.