Olive oil is an easy, quick and super hydrating treatment for your hair. Rehydrate your hair with these quick and easy steps for a hydrating olive Oil hair treatment. Warm ½ a cup of olive oil and liberally apply it to your hair. Cover your hair with a plastic grocery bag or saran wrap, and then cover with a towel. Let the olive oil set for 45 minutes, then shampoo and rinse, and style your revitalized, luxurious hair! Last tips from Monica Potter This treatment is great to do when you have some household chores to finish—just get the treatment started, then go and complete your other tasks during the 45 minutes ,and you’ll have beautiful hair and have accomplished other tasks in half the time!