It may only last a week or two. Marti, my springer had it and her head tilt didn’t quite go. Then she got it on the other side, so her head actually straightened. Poor dogs must feel so dizzy.
I found it helped to use a raised bowl, for food and water, as she was swaying too much dipping her head. I gave her wet food, because she couldn’t snaffle up kibble, or drink well.