Reviving an old thread.
Having the 986 S out of winter storage I decided to check the warm up time to full engine temperature (needle covering the 8 in 180). 40 degrees F and suburbian roads with little traffic, max speed 45 mph.
At 5 minutes the needle was between the second and third line, the third being the 180 degree line. At 6 minutes the engine was up to full operating temperature.
At higher ambient temperatures and/or higher speeds the temperature would have risen faster.
If you run a low temperature thermostat in the mistaken belief that it will reduce engine overheating (see
Low Temp Thermostats: What’s the Advantage? | Tuner University), then the warm-up temperature will be longer and engine wear will be higher.