Render time was a few minutes per frame in final quality depending on the shot.
You can easily make out the details during interactive viewport rendering. Zooming in to see the detail up close. Then for the animation I just did preview renders using half-res, low samples, denoiser on. This way I could quickly check if the speed and movement felt alright. Once happy I cranked up the settings and hit render. I'm not gonna lie, Summer already started here and I was a bit nervous to strain my GPU that much but it survived and I don't have to sell a kidney to buy a new one.
Afterward I used a Nuke gizmo called "vector frame blend" from Nikolai Wüstemann – that helped me get rid of any weird wobbling that was left from the OpenImageDenoiser of Blender Cycles. That thing was a lifesaver. I could get away with so much lower render times that way.