Long form navigation UX

I am working with a project that has a very long form (about 72 different input fields). And I am struggling with the best way to implement a user friendly design.

I have grouped and chunked the inputs into 4 different panels and I am using a progress bar to show user progress.

My problem is navigating between each panel, I feel as though having a toggle type animation would be best here where the previous form toggle away, and the next form toggles in. But I am unsure of speed or transition types.

Currently, I like the look of swing transition with 600ms. But I am a complete novice to UX so I am not confident in my choice. I am also unable to find any UX design material that clearly states what type of transition or behavior would be good to use in this use case.

Any insight from an expert would be appreciated. Heck even a decent article would be appreciated.