My initial plan was set the skillet's control to its maximum temperature of 450℉ (232℃) and record the surface temperature of the empty skillet in the center and the corners of an imaginary 9" square as it warmed up. I'd been thinking the center of the skillet would be its hottest spot, but it's actually one of the coolest. Within two minutes the center had topped 350℉ (180℃) and the corners hotter, too fast for me to record good readings, so I gave up trying to be scientific about it. By three minutes the center had reached 450℉ (230℃) and was still rising, while the corners were approaching 500℉ (260℃). Clearly hot enough to reach my target temperatures.