How long does it take to replace the blood cells in your body?

Question

I'm trying to figure out how often a vampire would need to feed, provided the blood was lost at the same rate as a human, and can't seem to find this information anywhere. (Yes... I have drastically too much time on my hands) I've heard that all of the cells in your body are replaced every 7 years, but what about blood specifically?

Answer 1

erythrocytes or red blood corpuscles are the real blood cells...these are formed in bone marrow and have a life span of 120 days....the life span of leucocytes or white blood cells is 12 to 13 days..........

Answer 2

On average, it take about 120 days to completely replace all the blood in your body. Did you try looking here?