How long would my ankle be swollen after i sprain it?

3 months: Mild sprain-~1 month moderate ~3 months severe- see podiatrist for reatment.

Varies: It varies a lot based upon the degree of injury. Sprains are usually considered as injuries to the ligaments that support a joint and are graded based upon whether they are stretched or torn. As such they can take from about 2 weeks all the way up to about 12 weeks to fully recover.