LOL, with NXT I could apply it to the whole car and wheels, have a beer, smoke a cig, and browse Reddit on my phone and still have some time to burn before I'd need to start removing it. Stuff is crazy soft, probably why it doesn't last very long.
CG Blacklight requires 15 minutes to sit on the car before removal so its an easy choice for "whole-car application." BFWD as previously stated is a great candidate for this as well, apply thin and within 5 minutes of coating the car by hand or machine it slides off like butter. In all honesty I think most sealants (and NXT belongs in this category) can sit on the car however long you'd like before wiping it down. I've never had to rush with those types of products.
Waxes on the other hand, are a different story. How a wax behaves during the application process depends on the temperature, humidity and the wax itself. In a humid summer afternoon in Houston, I can be more liberal with my time frame between applying and wipe down. During the cooler months in this part of the country, I tend to work panel by panel. I have had an experience with Blackfire Midnight Sun turning into a rock hard layer on the surface within 10 minutes in 40 degree weather. But this was a couple years ago, and the formula seems to have changed a bit. Just a word of caution.