I usually let mine warm up for the time it takes to get the windows cleaned off. That's usually 60-90 seconds. It's also plenty long. We had a cold spell here a couple weeks back. Actual temps of -30, and wind chills of -45. I would operate the car in this way, and had good heat within 2.5 miles, in which 4 minutes passed. I had FULL heat another four minutes and 3.5 miles later. That's less than ten minutes of run time for FULL heat at bitterly cold temps.
Warming up an engine is probably the worst thing for it. It runs excessively rich for an extended period of time, and just doesn't warm up.
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Generally speaking, if you were to get what you really deserve, you might be unpleasantly surprised.
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