Questionable arithmetic aside,
??? youre the one that gave the 2 + 2 < 36 => 1/13 figure edit: oh i noticed my mistake, that was a vital part of my argument yes, thank you for pointing out my arithmetic error
this sounds like it varies by system and connection capability. I didn't pay much attention to how much time Steam said a backup would take but in practise for me a backup took 45 minutes and a restoration took 40 so that was less than 1½ hours for both activities combined.
That's way faster than the unreliable connection I'm often needing even at its best, but surely also faster than many decent connections. To download (not including post-download install time) PSO2 faster than that you'd need an average speed of around 15 MB/s or 122 Mbps, though this will of course vary if you have an under-performing PC with a better connection.
and a reliable 15 MB/s download speed is what i have