For 3 or 4 potatoes, start with 6 minutes, flip, and set for 4 minutes. If they are still hard, repeat for another 4 minutes on high.
You can substitute sweet potatoes if you would like.
Some people like to jab the potato with a fork. I think that lets out the steam so I don’t.
You can add salt to the outside of your potato before cooking if you want. I do not. I let the individuals salt and pepper their own potatoes to their liking.