How long does it take to get used to glasses ?

Hi, I’m 30 years old and I just got a prescription for glasses. I’ve never worn glasses before and I’ve been really trying to get adjusted to them for the past couple weeks but I feel like I’m not adjusting to them and I’ve gotten an eye exam 3 times to make sure I got the correct prescription, Is this normal ? I also have visual snow syndrome, also my eye sight makes me feel dizzy and like I’m in a dream /difficulty focusing. Is there any tips anyone has that might help to get used to these glasses ?