This site has some details on the route and history.

This article from Red Bull describes the traverse and the Sandes, Gie & Reilly, and previous FKTs. Here's some of what it says:

The challenge involves successfully ascending the highest point in each province of the Republic of South Africa, in the fastest possible time. The current record is:

More info can be found on the challenge at - ninepeaks.co.za/

FKTs for each of the categories (see below) are given here:  http://ninepeaks.co.za/fkts.html

The Magaliesberg Major Traverse starts at Hartebeesport Dam Wall and traverses incredibly tough terrain for 77.49km all the way to Olifantsnek Dam Wall.  It has been done by hikers, but was first completed in FKT fashion April 30 - May 1, 2016, by Terence Vrugtman and Jason Gradwell, in a total time of 24h28m14s.

This is a Premier Route. To claim an FKT on this route, you must meet a high standard of documentation and verification. See details here: https://fastestknowntime.com/premier-routes.

The following description is taken from hikingsouthafrica.co.za/drakensberg-grand-traverse which is a thorough resource for those interested in completing this route.

Grant Strugnell posted this unusual FKT route: