LH 573 then TU 745 at Frankfurt
Johannesburg → Frankfurt am Main → Tunis
Timetable, Frankfurt am Main time
05:30LH 573 from Johannesburg at the gate
18:25TU 745 to Tunis leaves the gate
12 h 55 apart on the timetable
TU 745 leaves 12 h 55 after LH 573 arrives on the timetable: more than half a day, so not a connection we count.