Article: How long this takes depends on how dry or humid it is where you live. Paint will dry faster in dry climates and slower in humid climates. As the paint dries, it will take on a more chalky finish. Discard any leftover paint from when you applied the first coat; this type of paint does not store well, even in closed containers. This is very important. Just because paint feels dry to the touch does not mean that it is dry underneath and ready to use. Leave your project alone for 3 full days. If you use it too soon, the paint may peel off or turn tacky. Do not seal the paint with wax or acrylic sealers, or you won't be able to use it as a chalkboard.
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Let the paint dry for a few hours. Let the paint dry and cure for 3 days.