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Correction for the size of a Blood Donation

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How big is 815.30 milliliters?
It's about two times as big as a Blood Donation
The size of a Blood Donation is about 500 milliliters.
(American Red Cross donation volume)
The typical donation amount when giving blood is about 500 milliliters. Donated quantities of blood typically have a viable shelf life of about 42 days.
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