For a hair mask, you can leave the oil on for anywhere from 30 minutes to several hours, or even overnight with your hair covered. The key to avoiding a greasy result is the amount used and thorough rinsing. For medium-length hair, start with a teaspoonful, focusing on the mid-lengths and ends where the source notes it helps brittle hair feel smoother and regain softness. If your scalp is dry, massage a few additional drops directly into it.
To rinse, apply your regular shampoo to dry, oiled hair before wetting it. This helps emulsify and lift the oil. Then add water, lather, and shampoo a second time if needed. Follow with conditioner. This method helps coat the hair shaft for shine and softness without leaving a heavy residue. For fine or oily hair, use less oil and a shorter treatment time. The product is intended for cosmetic conditioning of hair and scalp; it is not a treatment for medical scalp conditions.