I would give it at least 24 hours.  I can't remember on mine whether I gave it one day or two (it's been a LONG time!).

If you give it more than a few days then scuff the paint that's to get the trim -- Rustoleum that's just a day or two old makes a great surface to stick Rustoleum to, but if you give it the two weeks it needs to be fuel proof, then it turns out to be Rustoleum proof, too.  I don't know when it changes from Rustoleum Ready to Rustoleum Proof, but it does.  I have an otherwise nice Twister whose fuselage trim is chipping off over time because of this.