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Specialised Paints recommend 10 minutes between coats of the same paint (base, colour, laquer) and 60 minutes between different types of paint. But as Matt says, it depends on the temperature. I hurry things along using lots and lots of halogen lights, but doing 4 base coats, 3 colour coats and 4 laquer coats still takes an awfully long time. Especially when you're gimped up in a Tyvek suit, double-layer Nitrile gloves and a positive-pressure full-face respirator...
How long between coats?