Hbomberguy has a really good video about all of the problems that plagued production. It’s a pretty interesting watch that covers the way the story was put together, where the writers got their ideas from, and a bunch of behind the scenes stuff.
It’s pretty interesting: RWBY Is Disappointing, And Here’s Why
My last big boss fight in PF2 lasted about 3 hours and there were 10 rounds in that time - so about 1 round every 18 minutes. The party consisted of six level 12 characters - counting the GM, that means the average turn was about 2.5 minutes long.
(That includes some RP as well, villainous monologues, rescuing the hostage, etc)
Granted, I use the Foundry VTT, which speeds things up quite a bit. (And is also how I was able to review this data). And most of us are experienced with the PF2 system at lower levels and had jumped up to level 12 for a oneshot.