How long does it usually take a sprained ankle to heal?

I sprained my ankle today going down the stairs and I'm super worried cause I have so many projects due by the end of this week and a presentation. My mom tells me to walk or off but sometimes it hurts a lot and sometimes it's not too bad. I haven't gotten it checked out professionally yet cause I would have to commute there and where I am it's been raining/sleeting so I'm worried about slipping.
How long does it usually take a sprained ankle to heal?
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