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well i suppose its all to do with how your driving the car!
for some people who are taking it easy and keeping below a certain rpm it could take 10 mins or so,
but for others who are revving the nuts off the engine even when cold it will be warm in a min!
when driving my own cars it usually takes a while cos im not a fan of revving cold engines. but when in work vehicles (usually a diesel) (and i dont care about the health of the car) i just drive it basically on the limiter and its warm in 30 seconds.
i suppose it depends weather your willing to sacrifice a bit more engine wear for a bit of warm air!
but to be honest i just go and start the car a couple of minutes before i leave in the morning. and by the time i get out there its just started kicking out warm air. i know its not good for the environment but i leave for work at 6am, i just cant handle getting into a car that cold!
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