Alclad II metallic paints are laquers and, as Vric pointed out, do dry very quickly. If you have the time be safe and let them cure for 24 hours before doing anything else to them. If you don’t give them a couple of hours at least. There is no cut-and-dried curing time for them, just as there is none for any other paint. It depends on many environmental factors such as temperature, humidity, air circulation, etc.
Their primer, on the other hand, never seems to fully cure. I used it for a while and finally gave up because I never could get it to behave. There is probably a way, and it’s probably something I was doing wrong, but at times it would still feel tacky weeks after it was sprayed. I even have a little test model I sprayed with it that still felt tacky 6 MONTHS after I sprayed it.