How do you dehydrate oranges without a dehydrator?

How do you dehydrate oranges without a dehydrator?

Slice your fruit about 1/8-inch thin if you can; a mandolin would be ideal but I don't have one so I just (carefully) used a sharp knife. Lay the fruit slices on the baking sheet and place in the oven for anywhere from 4-12 hours (again, depending on thickness and water content).