Well, when I switched to “Endurance” battery mode around 22-25 hours in (I thought I’d done so at 22 hours in when I got the 20% battery left warning, but then I had another warning later and selected - had to select? - that again, which made me unsure of what was happening… and I myself was at a point of sleep deprivation that made me unsure of anything), I think it deactivated AOD, and it continued recording to 31 hours 36 minutes.
Around 10 hours more on 20% battery. Which sounds rather good.