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I was told to spend a bit close to 5 minutes at idle strictly because the oil takes way longer to warm while driving due to the oil cooler. But most of the time I used this modified routine:
a) Start car and idle about 2-3 minutes
b) Roll in 1st gear, no gas, to get out of the shared parkade
c) Stay below 3K rpm before shifting, but just about 2K rpm after shifting, try to stay below 50Kmh (30mph) and slowly accelerate if there is no traffic
Usually by about 13-14 minutes after starting, oil will be about 75-80c will should good enough for normal or even slightly aggressive driving. I don't really have the luxury to extend some of my trips to be longer than 20 minutes every time I start the car from cold though. Idling for 5 minutes to me is a bit excessive waste of gas
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