Generally, this would depend on what works best for you. This would come under the 'Custom Drying Step,' and as it takes your hair about 2 hours to dry, you'll definitely find you'll need to use a blow dryer to get your drying time to an hour! You'll have to see how long it takes to blow dry your hair and see whether having a period of air drying would be needed to keep you at the hour mark and stop you from going under it!