I'm probably one of the most impatient people in the world and I hate to wait for paint to dry.
You are lucky in that you are using flat paints since they dry faster than gloss for some reason. I have, in the past, painted enamel over enamel after giving it an hour to dry. I don't like to, and it has caused problems before. Note that I didn't say it was a good idea, only that I've done it in a pinch.
To speed up drying time I usually use a fan. Let the surface dry to the touch so the paint is pretty much leveled out, take a box with one side cut out, put the model in it, and sit the fan on the side you cut out. The box walls will cause the air to bounce around and circulate some instead of just blowing over the model surface.