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According to this page "The heart pumps about 2,000 gallons (7,571 liters) of blood a day through its chambers." 2,000 gallons per day works out to 83 gallons per hour, or nearly 6 quarts per minute. So it takes about one minute for blood to make the round trip to the heart.
According to this page "The heart pumps about 2,000 gallons (7,571 liters) of blood a day through its chambers." 2,000 gallons per day works out to 83 gallons per hour, or nearly 6 quarts per minute. So it takes about one minute for blood to make the round trip to the heart.