Camera arrived today. Gonna take a while to figure this thing out.
From the manual:
Motion pictures with their file size set to [4K] in [MP4]:
Recording stops when the continuous recording time exceeds 15 minutes.
When you are using an SDHC memory card, you can continue recording
without interruption even if the file exceeds 4 GB, but the motion picture
file will be recorded and played back in separate files.If using an SDXC
Memory Card, you can record a motion picture in a single file even if the
size is greater than 4 GB.