Without question, South Africa has the slowest average time, clocking in at 41:11 mins.
This is 15 minutes slower than Denmark (26:02).
It’s hard to explain why South Africa’s average time is so much slower than every other country. It might be explained by a diet rich in biltong and boerewors (an SA favorite at barbecues) but it probably has something to the difficulty of the routes and the number of participants at these routes.