What Is The Treatment For Ankle Sprain?

I sprained my ankle running. It happened when I landed awkwardly on a small hole in the grass. I heard three pops on the top outside of my foot. My ankle is not swollen; however, it hurts terribly when the foot is rotated so that the outside of the foot goes down (if looking from ankles to toe horizontally, rotate the foot counter clockwise)--not pointing the toes in an out.

How long does this normally take to heal?