I have one of the industrial paint remover type heat guns with two settings, high and low.
On high with 1/16 and 1/8 oz. jigs, about 4 or 5 seconds, if not slightly less. Its really too hot for the 1/16 oz jigs, especially flat ones like the minow head Do-it molds. Round ones are not too bad but you can melt the 1/16 oz. in a blink. Once they soften their gone.
One nice thing is that if they're not quite hot enough, you can heat them up again and the paint will either flow enough to cover them or you can put them back in the paint. I've made some pretty nice looking two tone jigs.
When you get to 1/2 jigs it takes considerably more.