SA 578 then LH 573 at Johannesburg
Durban → Johannesburg → Frankfurt am Main
Timetable, Johannesburg time
19:50SA 578 from Durban at the gate
19:45LH 573 to Frankfurt am Main leaves the gate
23 h 55 apart on the timetable, overnight
LH 573 leaves 23 h 55 after SA 578 arrives on the timetable: more than half a day, so not a connection we count.