Want 210 degree internal temp. At high altitude ~6500', oven at 425. 2 medium russet potatoes, poked with a fork, lightly oiled and salted on center of middle rack. Room temp to 200 degrees, 1 hour. 200 degrees for 45 minutes. Couldn't wait any longer. This is the 3rd time this has happened. Oven door never opened, temp monitored with leave in digital food thermometer then checked when removed with Thermapen to check functionality of leave in thermometer, both read 200.