A way to speed up the cooking is to insert a clean nail into the center of the potato before cooking. The oven will heat up the nail and transfer the heat to the middle of the potato so that it cooks from the outside, but also from the inside. Do not try this if you are using a microwave though.
How much time do you find that cuts the oven time by Andy?
At a club I belong we found out that the electric roasters make great baked potatoes. Of course they are cooked for a long time. I think the secret though is moisture!!! They are cooked in big batches, at least 5 lbs at a time individually wrapped.
I am going to try wrapping the potatoes in foil, place them in a bread pan, Sprinkle the pan lightly with water and tightly cover the bread pan with foil. This should simulate the same environment of the electric roaster.