Google....
The U.S. Strategic Petroleum Reserve (SPR) holds roughly 357 million barrels of crude oil. This represents about half of its 714-million-barrel authorized storage capacity, with levels near their lowest points since the early 1980s following drawdowns to counter energy shocks.
The Strategic Petroleum Reserve (SPR) is a federally-owned, emergency stockpile of crude oil meant to mitigate global supply shocks, whereas Total Oil Reserves refer to the nation's total underground deposits of extractable oil. The SPR is a short-term geopolitical buffer, while total reserves represent long-term domestic assets.
Our total reserves is 46 billion barrels estimated. How long that takes to extract I dunno.