I upped my resolution to 992x736 (I had been doing 832x640), but that slowed rending of this video down to 148 minutes, just two minutes shy of 2.5 hours.

I had already decided to give into getting an RTX 5090, reading that it would do this kind of work 2-3 times faster.

But what about FOUR times faster?

Yep! I ran a test on Runpod.io using a 5090, same workflow, same prompt and inputs, and got the same rendering job done in 37 minutes.