only on the real cold mornings there is a need to warm your car up. And even then, no need to do it all the way to operating temperature, just until the needle starts to move ~60 seconds. A good way is to get into your car, start it up THEN get comfortable ie. put seatbelt on, put bag in the back, put a good cd in etc. That usually takes about a minute to do.

During hotter months no need to warm it up. Just don't go into VTEC until it is at operating temperature.