Correction for the size of a Blood Donation
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How big is 641,307,800 gallons?
It's about 5,000,000,000 times as big as a Blood Donation
The size of a Blood Donation is about 0.10 gallons.
(American Red Cross donation volume)
The typical donation amount when giving blood is about 0.10 gallons. Donated quantities of blood typically have a viable shelf life of about 42 days.