As a long time Zaino user, I can say that the first application takes forever. But if you keep up with maintenance it is really fast. I can wax my X3 in under an hour using a modification of their technique...

I use Z1 and Z2 (with regular Z6 for daily dusting). I apply Z1 to a panel, then apply Z2 over it. By the time I have applied my way around the car, the first panel is dry and ready for removal. The best part is the lack of white residue in the cracks.

FWIW I applied the stuff in a garage in Munich when it was only about 20 degrees. The ZFX cured it quickly and the process did not take materially longer. I have also applied it outside in the middle of summer in Los Angeles with no trouble.

I have tried many different types of wax and one of the things I like about Zaino is that it comes off so easily. If you use really thin coats and let it dry thoroughly, the stuff comes right off.