Yes, 425
of your little finger, or just about (read "MUCH larger than a normal household gas range/stovetop).
If I use cast Iron and heat it till it is smoking hot, I can do decent stir fry, but sometimes I set off our smoke detectors.
Best stir fried fried rice I EVER, EVER made was out on our propane camp stove, set up in a "summer" kitchen on our patio. We use a Coleman white-gas-to-propane converted stove and one day for dinner I made fried rice. Heated that pan, a 12" cast iron pan, a good while til it was hot, Hot, HOT, and got that really goooooood hot-woked flavor. It tasted exactly like the stuff I love down at a local Pho cafe. I cannot do this inside with our regular gas burners, nor can I do it with a smaller pan. Sometimes I come close in the house, but I am usually cooking a *very * small amount in the biggest pan I have (that 12 incher cast iron skillet).