Plus, if you were to ask me, I don't really have a specific sentence duration in mind which I would consider to be sufficiently long, so it would entirely come down to my takeaway from whatever the judge says.
Eg if the judge gives him ~10 years stating that he did indeed intentionally fraud people out of $8B, it'd be okay. But on the other hand, if it seems like they're intentionally avoiding the obvious fraud to make his charges weaker, it obviously won't be satisfying.