10,000,000,000 barrels/20,000,000=500 days.
Barrels have a variety of uses, including storing liquids such as water, oil, alcohol, arrack, and liquor. It is also used to preserve aged beverages such as wine, cognac, Armagnac, sherry, port, whiskey, and beer. Other items once stored in wooden barrels, such as gunpowder, meat, fish, paints, honey, nails, and tallow, include:
Early barrels were tied with wooden hoops, but these were gradually replaced by metal hoops in the 19th century. The term keg can also refer to a nearly cylindrical container or barrel made of modern materials such as plastic, steel, or aluminum.
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