SA 31 then 4Z 921 at Johannesburg
Gaborone → Johannesburg → Cape Town
Timetable, Johannesburg time
08:25SA 31 from Gaborone at the gate
07:304Z 921 to Cape Town leaves the gate
23 h 05 apart on the timetable, overnight
4Z 921 leaves 23 h 05 after SA 31 arrives on the timetable: more than half a day, so not a connection we count.