How long is the longest anyone has ever had it at the level 9.9 scale of it? Where each attack throughout every day is as bad as it can get, day after day, on and on.
I'm not asking about a total cycle duration where you may have weaker surface-level ones at the start or end of the total timeline, I'm specifically asking about the extreme deep-penetrating types that sooner or later always go away, but you sometimes wonder, "What if they don't go away?".
Has it ever happened, where they don't go away? I doubt it but how do we really know, if that person ended their life when they thought it was never going to end. To provide a measurement of a maximum known timeline, what is the longest period of time that someone could "bet on" that the really bad ones finally slow down and get weaker?