I let the orange peels sit out for 8 hours like the recipe said. They were still too moist, I rolled them in sugar and they didn't get any drier. Fortunately, our portable oven as a dehydrator setting. I put half the batch in the convection oven on dehydrate for three hours, occasionally turning them around with tongs. They look ever so much better. So I know for next time to put them in the oven to dry rather than trying to have them air dry.
According to something I read online (I can't remember where) we average 72% humidity, no wonder my citrus peel didn't want to dry. Now you know why I don't need a humidifier!