Dehydrate the cayenne peppers at 135 degrees F for at least 5 hours, or until they are completely dried through. It could take up to 8 hours or longer. Just follow the recommendations of your dehydrator. You can speed up the drying process by chopping them into smaller pieces before dehydrating.Click to see full answer. Similarly one may ask, how long does it take to air dry peppers? about 2 weeks Furthermore, how do you dry cayenne peppers in the oven? To dry cayenne peppers in the oven, spread the peppers on a baking pan or cookie sheet. Turn the temperature of your dehydrator or oven to between 120 and 140 degrees Fahrenheit. Turn the peppers with a spatula at least once every hour to promote even drying. Drying in an oven or dehydrator can take up to a day. Hereof, how long does it take to dehydrate cayenne peppers? 8 to 12 hours How long does it take to grow cayenne peppers?Sow the seeds in light, well-drained soil medium and keep in a sunny location at a temperature of at least 60 F. (16 C.) until the seeds sprout in 16-20 days.