Drying Tomatoes: In the Oven or the Dehydrator.
Aug 28, 2020 Arrange the tomato slices onto the dehydrator trays, place them in the machine, and close the lid. Dry the slices for about 8-12 hours, checking the center slices after 8 hours. The end slices will take slightly longer. If your dehydrator trays stack onto a central heat source, I recommend rotating the trays after 8 hours or so.More details