Push the red button and go. Takes anywhere from two to 10 miles to warm up..depending on ambient temperature. And as with any engine, don't twist up the rpm's quickly, until everything including the driver is warmed up.
Transmission, particularly with a cooler, takes much longer than engine or supercharger coolant to warm up. You'll know when transaxle fluid is warm, transaxle will be quieter and gear selection will become smooth.
I run it for a minute or two and then go easy until it hits temps. Transmission is much more of an issue - as it grinds between 1-2-3 until warm, unless you take an extended time between shifts, or double clutch. This is on 3 GT's that that I have driven...
You mean like sitting on the driveway? I haven't done that since the 60's. It takes way longer to warm up at idle than just being ginger with it until it gets to temp. In Vegas in the summer warming up is almost instantaneous. This time of year, it's up to normal temp in about 2 miles. That's OK since the transmission is also catchy 1-2 until it warms up, and it also helps the tires get a little more sticky.