Pizza is one of my favorite foods. When I order a pizza, there's almost always left overs. I'm not sure how you eat your left over pizza, but I prefer to re-heat mine, usually by putting it in the microwave. And now, my life is forever changed for the better.
No longer will I have a soggy crust from a re-heated slice of 'za because the best way to re-heat left over pizza is in a skillet. I don't know why this has never occured to me until now...I make grilled cheese sandwiches in a skillet, and they're delicious. Use the same process on a slice of pizza, and you get a left over slice that has a crisp crust!
How do you know when it's done? When the cheese is melted...It's that simple. Try it for yourself, and enjoy!