A bit longer Sean... But 16-24 hours is common. Just check your can
(VMans advice is sound if your going to clear or add another colour to parts like the 18 Flash...Id even allow 2 weeks when highlighting).
Usually you can second coat up to a couple of hours, but after this time it needs to cure before a second coat should be applied, otherwise the thinning content will blister the initial coat.
In the fist 10 mins to 2 hours approx,the thinner content will still be present and will allow the second coat to blend successfully, depending of course on paint type
Remember, Read the can mate, it will give you correct times, as brands Vary..
Trial and error is fine, but manufacturers recommendation is best
