[JThiessen]

Let it idle for about 30 seconds for general driving conditions as you stated. The goal is let your Pre-turbo EGTs get to around 300 degrees.
Obviously DC feels that your turbo will last at least though the warranty period wihtout the need for this, otherwise we would have decent guages from the factory. But if you have the intent of keeping your rig for 200+K, I'd highly recommend a good set of guages.