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835 cubic kilometers is about 2,000,000,000,000,000 times as big as a Blood Donation
In other words, it's 2,000,000,000,000,000.000000000000000000 times the size of a Blood Donation, and the size of a Blood Donation is 0.000000000000000500 times that amount.
(American Red Cross donation volume)
The typical donation amount when giving blood is about 0.000000000000500 cubic kilometers. Donated quantities of blood typically have a viable shelf life of about 42 days.
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