But the point here is to refer to the other link from Redditor Mailanka on sub crew duties.
A US Navy sub like the Ohio Class has 155 guys on it per Wikipedia. Just ballparking, the volume of a 170m cylinder 13m wide is 22000 cubic meters, so the crew density is one dude per 150 cubic meters or so. A Jedi Cruiser from TCW at similar values would thus have 100,000 guys on it, but that's way beyond anything we ever saw or had hinted to us, I'd say by a hundred times at least. An ISD has almost five times that volume.
The crew count of smaller vessels like the stealth ship and the Republic Frigate would be huge at such figures. The frigate would need 128 people, but in reality we see a crew of what, maybe half a dozen at best in "Jedi Crash" and elsewhere? I think the crew was more like two or three, so we could probably go even lower. If the frigate suggests 20 times or more fewer people, then 5000 for a cruiser is in the right range, at least.
See also the bottom of this page on volumetrics and crew densities where similar figures result.