Unless I'm mistaken water-based systems need less time to cure, unlike urethane or enamel systems which need anywhere from 30-60 days cure time. To be safe your frined should find out from the painter what exactly is on the panels, and subsequently how long before waxing.
In the meantime, you can put on a hand glaze such as 3m imperial hand glaze. This glaze allows the paint to properly cure, while leaving a nice finish. Also, it can be used regularly until you are ready to wax or seal.