The attack would be mostly automated, so whoever is behind it wouldn't need to spend many minutes per day to keep it up once started.
That's some fortitude right there.
If the DDoS is going after FFXIV servers though it wouldn't hit those other games necessarily. Also your location helps, I am in the far northwest and didn't start getting git hard till yesterday while others started getting hit days ago. They're swamping different nodes that you might not route through to access other things.