Approximately 23 seconds I believe this response to be wrong and based on the movie "The Number 23", which is fictional and bases it's theme around the 23 enigma which is selection bias at it's best!...
Let's put it this way - if all your blood vessels were laid out end-to-end the would stretch around the would nearly 2-and-a-half times.
That, by the way is true... but don't ask who tested it.