4Z 756 then 4Z 799 at Johannesburg
Mthatha → Johannesburg → Port Elizabeth
Timetable, Johannesburg time
19:004Z 756 from Mthatha at the gate
18:154Z 799 to Port Elizabeth leaves the gate
23 h 15 apart on the timetable, overnight
4Z 799 leaves 23 h 15 after 4Z 756 arrives on the timetable: more than half a day, so not a connection we count.