Ok, so hair care routines are not very easy to follow and varies from person to person depending on their hair types and textures but I really would like to get an idea on certain topics which keep me confused and this is one of them? How do you know how long should you keep the conditioner on?Well, here is what I do? Squeeze out all the water by gently pressing the hair after shampooing it. You can use a cotton cloth if you want so as to remove the excess water. Now, apply conditioner from the level of your ears and cover the length of the hair and concentrate on the ends. Keep the conditioner for 5-7 minutes instead of just applying and washing it out. After 5 minutes, you can wash out the conditioner. But, if I am using a hair mask too, I like to keep the hair mask for around 5-7 minutes and wash out the conditioner in just 1-2 minutes.