Take much longer
Dr. Fowler has provided great steps for managing a sprained ankle.
If you don't rest it though, the swelling, pain, and bruising will persist and healing will take longer. Depending on extent of injury, it can also be hard to tell a sprain
from a fracture
without xray. Pain may force you to stay off your foot for awhile. Unless you want a less stable ankle over time, resting it is essential.