Anyone ever hurt their ankle a small bit before? How long did it take to heal?

Yes it can take ages, and while I know you're not looking for medical advice, I would say that this is more from my own personal experience: you really need to be very careful about pushing things by treadmills and the like. Injuries like that can seem to be better but in fact the weakness remains for months or even permanently if you don't take good care at the time. You do need to strengthen it, but not by going at it like a brute.

So my non medical advice would be to go to the doctor and see whether it's too late now to start taking proper care of it. I sprained my ankles badly at two different times in my life: first time I was a student and typically careless, second time was the other ankle, when I was in my early 40s, and that time I did everything right, including physiotherapy. Ten years later, it's the first injury that has left that ankle permanently weakened especially on uneven ground, even though the more recent one was probably worse.