How long does Acrylic colors take to dry?
Acrylic paints are water based paints but resistant to water when dry. Also known as fast drying paints Acrylic colors take almost 30 minutes to dry and recoating can be applied on them after 4 hours.
Thin coating of Galeria / Professional Acrylic dries in 20- 30 minutes or so and a thick coating takes almost an hour or two to dry.
Whereas regarding reusing of Acrylic paints that are left on the palette, if moist then they can be used after half an hour.