How much money - cash - does the House of Saud hold? Even with hundreds of princes and princelings spending it like... well... like a Saudi Royal spends cash, it's going to take longer than that to deplete their reserves. And between now and then, maybe they install 100 sq miles of solar panels, and an electric "pipeline", and provide the entire Middle East with power for pennies. I dunno. I expect they have a very deep reserve, and it will take some time to deplete it.
Somewhere between zero and 100% of Saudi Aramco's holdings. Saudi Aramco thinks they have 2 trillion dollars worth of oil reserves. Bloomberg thinks they have $400 billion. I don't think Saudi Arabia divests 10% of Aramco when the West thinks they're off by a factor of 5... unless they have to. they're now talking about listing it in Russia or China which would be a big FU to the United States... and considering Iran is a lot closer to Russia than they are to us, could be interesting. 