It takes between 30 minutes and one hour to roast a sweet potato in a 375-degree oven. The total roasting time depends on the size of the sweet potato.
The sweet potato is drizzled and rubbed with vegetable oil and then pricked multiple times with a fork before it is loosely wrapped in aluminum foil. The potato is set on a baking sheet and then put into an oven that has been pre-heated to 375 degrees Fahrenheit. After 30 minutes of roasting, the potatoes are tested for doneness; they should feel soft when squeezed, and a fork or sharp knife inserted into the center should glide right on through the sweet potato. If it is not roasted adequately after 30 minutes, the potato should be put back into the oven and re-checked after 10 minutes.