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3,600,000,000 bytes / 86400 seconds (in a day) = 42kB/s, or ( * 8) 333kbps, enough for a very high bitrate audio stream.

Semi-related: I remember once I was checking on a friend’s network for them, and in the router stats there was a device downloading like +3TB/month (and a proportionate +3TB/month upload also, from a spread of devices) of computer they don’t use for anything except watching the camera feeds on their LAN.

Invariably it was because they used the vendor’s (Amcrest) camera viewer software and set it up via their ‘cloud login’, and already had the IP cameras linked to his account (on previous setup), that when he added the cameras to the viewer, it was pulling them by proxy of the vendor’s TURN-like relay (despite being on the exact same network).

When they removed the cameras, and then set it up through a separate flow by scanning the LAN only, and adding them by LAN IP directly, then it wasn’t feeding their whole damn household through an internet relay (which, I checked the IP, and not even the vendor runs it, they outsource it to some other company to provide it).