5Z 511 then 4Z 759 at Johannesburg
Kimberley → Johannesburg → Mthatha
Timetable, Johannesburg time
16:555Z 511 from Kimberley at the gate
14:104Z 759 to Mthatha leaves the gate
21 h 15 apart on the timetable, overnight
4Z 759 leaves 21 h 15 after 5Z 511 arrives on the timetable: more than half a day, so not a connection we count.