Oh my goodness, I needed that laugh --- most definitely, if it is 100TB then 24 hours could be what happens. My goodness --- my first computer was a TRS80 (the Trash80, we called it) and I doubt anyone at that time even dreamed of a 100TB unit.
But, yes, with 100TB it could take a very long time, especially if there is a problem with the disk.
Still, I never thought of 100TB and so ... well, you have the experience here; I don't. I can't even imagine 100TB. I think at 100TB that unit would be running me, not the other way around.