Temporal Denoiser for path tracer movie renders

The aerial view I was rendering used 23.7 / 24gb of Vram and 63 / 64 Gb of Ram for a 4k image with 500 samples. The 1080p video renders weren’t so heavy on Ram usage, but it was still spilling over from the Vram and slowing things down a bit.
I renderd out about 1 minute of 1080p video of interior and exterior views and it took about 34 hrs to render. The interior ones were much slower though, (it was a gallery interior, lots of smooth light surfaces and lot of lights and high poly assets)

The design is public now so I am able to publish the results, these are the animations I made using the path tracer. The denoising in Davinci did a very good job on exterior scenes, but you can see some remaining noise/defects in the upper corners and soft shadows of the interior scenes. If you watch at 720p the compression artefacts hides the noise problem, but at 1080p it is vissible.
Exterior was around 400 spatial samples, and interior was around 700 samples all with eu4 denoiser turned off.