Something interesting I did for fun to see whether or not it would be worth FGO using a 64-bit signed integer (max: 9,223,372,036,854,775,807) for storing QP. Assuming you're doing a lottery event and can open one box every second of the day which would be 86,400 boxes per day since there's 3600 seconds in an hour and 24 hours in a day. Assuming each box gave five million QP it be 432 billion QP per day. It would take 21,350,398 days to max it out or 58,494 years. Even if we multiply it by two for ten million per box it would probably only half the time required which still would be longer than anyone would live for. So using a 64-bit integer would be pointless.