I know it's gonna take over 5 hrs, but it also takes over 5 hrs to deplete.
People never grinded for a couple hours before? I'm not even a hard-core farmer (everyone can tell) and I already had my fatigue getting high.
Also, despite the cynicism, you seem to miss the point.
Fact is that it is ridiculous to punish people to actually play your game opposed to rewarding them.
Even if you will never hit the cap, as you say, it is useless at the most.
Or are you going to deny even that?