I never studied past pre algebra in high school and didn't really like math but am now interested to learn it on my own. I'm at a pretty basic level right now, did the o levels math and that was it (got a B lmao)

I am studying to be a vet, and I am doing this out of interest. How long should this take realistically? I do want to thoroughly understand what I'm learning, but one goal of this project is estimating my intelligence, so what time would be 125 iq or so? 3 months? I also want to learn math to challenge myself, because I've always struggled with math (I find mental math a little hard) and I've been good at verbal ability which really reinforced in my earlier years that math is just not for me.