At times like this I get to pull out one of my favorite comedians to quote from.
“I like baked potatoes, man. I don’t have a microwave oven; it takes forever to cook a baked potato in a conventional oven. Sometimes I’ll just throw one in there, even if I don’t want one, because by the time it’s done…who knows? I’ll throw a potato in and go on vacation.”
This has alredy been well answered but you might like this information. Unlike a microwave, the difference in time between baking one potato in a conventional oven and baking ten potatoes in there is small enough to be ignored. I usually figure on one hour at 400 degrees, for potatoes of a certain size, the size I generally have.