Baked Potatoes take between 1 hour to 75 minutes to fully bake and be ready to eat.
A baked potato will be fully baked and ready to eat when you can easily take a fork and pierce the bake potato with the fork.
If the potato is hard to pierce with a fork then it's not quite done baking and should be baked a bit longer.
The potato should be fully baked though once it's been baking in the oven for a minimum of 75 minutes.