Question: how long should you leave coconut oil in hair before washing?
Answer: Any time! Coconut oil can start working for you before you even get your hair wet. Apply it as a prewash, i.e. "treat hair for 15 to 30 minutes with coconut oil before shampooing in order to protect hair from absorbing too much water," says Wizemann. This cuts down on frizz and makes hair easier to style post-shower.