it depends on how cold it is outside...
summer time, about 30 seconds to a minute...
fall, 50*, a minute or two..
winter, 40* or below, 5-10 minutes until heat comes out the vents, or over 120* on the guage...
the problem i have, is that when the car is warming up and in high idle, its also givin it more fuel...
if i try to go, and drive it without warming it up, it runs stupid rich and smokes fuel smoke...
thus making it choke and sputter until its warm anyway...