To dry herbs quickly, park your car in a sunny spot, spread the herb stems and leaves on a baking tray and place the tray on top of the dashboard, under the windshield. Now, roll up the windows and close the doors. (Hint: you don’t have to remain in the car. In fact, I would discourage this practice.)
The herbs will dry quickly, often in just a few hours, certainly before the end of the day, and since they dry so quickly, there is no risk of mold forming.
Also, your car will give off a delicious aroma for several days!