If you are going to get anal (and doing it to 2 d.p. I reckon you are

) then the OP said that it was 6.3 miles. No point in calculating it to that level of "accuracy" when you mis-read the question by 5%.
I wrote something similar about a month ago. My journey times are between 35 minutes (gentle and relaxed, barely sweating) and 30 minutes (unable to walk or talk for 5 minutes and wringing the sweat out of my clothes).