It depends how long your legs are. For example if your legs were 8.5 miles long you could do it in a second.
A more realistic estimate would be between4 and 6 hours for someone of average ability.
15 to 17 minutes at average walk pace and 12- 13 minutes at slow power walk
17 minutes.
About 17 minutes.
25.5 minutes.
51 minutes
Well, how fast are you going on average?
1:02:17
17 minutes
1133 seconds
1 hour 17 minutes
15 minutes, 41.54 seconds
About 33 minutes.