Nitpick: It depends on what "over one hundred billions" means. You could only give $1 to 1 billion people of you have $101 billion, but if you have $999 billion

Nitpick: It depends on what "over one hundred billions" means. You could only give $1 to 1 billion people of you have $101 billion, but if you have $999 billion then you could give $998 to 1 billion people without violating the digit constraint. My guess is that it's closer to your estimate, about 1 day of wages, but it could be 2.7 years of wages at most.