How long will it take a potato to bake at 350 degrees?

It will take about 2 to 2.5 hours. For a large potato at 350 it takes an hour so at 250 it will take longer. I bake mine at 450 for an hour and it comes out with a crispy skin and fluffy inside. I butter the outside of the potato before I bake it to get a crispy skin on it.