based on the assumption that human blood can survive in a vampire for about the same amount of time it can in a human body, vampires would only need to feed three or four times a year (red blood cells live about 110 days on average). this would be if they completely drained all their victims.
humans can survive losing up to about 40% of their blood, which means that a vampire pushing their limits with each victim would probably need to feed 12 times a year minimum
so like once a month
Hey guess what else happens once a month involving blood
omg no
Now that’s recycling
“Actually, period blood would be really good for a vampire; it’s incredibly nutritious, because it’s supposed to feed a foetus! And it’s probably the cleanest blood in the human body. It’s sterile.” My wife contributed.
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