Anybody got info on how much data an instance uses per user?

I recently purchased a NAS and was considering installing an instance on it. but being that this would be on my home network, i'll probably cap it at like 50 users or something. I found one post where someone was saying that the RAM and CPU usage was pretty low, but what about network usage. My NAS also runs Plex and i'd hate for my max 30Mbps to be overrun by the lemmy instance.

Anybody got the data on whether or not it would be viable?