How long does it take for a foot sprain to heal?

Depends on : How bad the sprain is. I would advise an ankle brace while walking until you feel no pain at the location of the sprain.

Sprain: Sprains are graded as to their severity . Some sprains can take as long as a fracture to heal and need bandaging and cam walkers or crutches . See your podiatrist for this answer as it requires a physical exam and determination of the severity before any prediction can be made