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So in the water, not the land.
At the current usage rate, how long would 511 billion barrels last?
Googling says 36.4 billion barrels per year as of 2018, so 14 years.
That kind of calc isn't fair though because there's a ton of protection everywhere else.
Of course its just an estimate. I'm sure the "burn rate" will change between now and whenever it could be extracted, if that ever happens.