iNd3xed t1_j2avjsv wrote
Reply to comment by SirDuke6 in ELI5: Why does putting one foot out from under the blankets bring so much relief of heat while laying in bed? by SirDuke6
Although the above comment is not wrong about the high speed of blood this is only the case close to the heart.
In smaller blood vessels, and especially in veins, blood flows much slower, as low as a couple of centimeters per second in the index finger [https://pubmed.ncbi.nlm.nih.gov/11284002/]
Not that this helps answer the original question by much, but this adds some nuance to the answer
fiendishrabbit t1_j2ay0ih wrote
If I remember my biology right, on average it takes 45 seconds for blood to make a full round-trip. Very fast in the aorta, much slower elsewhere.
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