My party's sessions are 4-6 hours once a month, an I would say only around 45-90 minutes are the actual campaign, but spread across that entire time.
In my own testing I haven’t used audio with quite that high a “table talk” ratio, but in general I’ve found the system is quite good at filtering out anything that’s not “ttrpg-ish” in the transcript.
I’d add, there is basically a built in aspect that tries to identify table talk, and Ive played around with features that will attempt to look for “amusing” bits within that to call out. Not currently live, but the structure to filter things that way is still embedded.