Can you please list flight numbers (flight codes) for some of those flights, for future references.
Johannesburg - Perth - Johannesburg
South African Airways
SA280/281 (SAA280/281)
Departs Johannesburg every day at 21.10
Departs Perth every day at 23.50
Sydney - Johannesburg - Sydney
Qantas
QF63/64 (QFA63/64)
Departs Sydney every day at 10.50
Departs Johannesburg every day at 19.10 (usually)
Johannesburg - Sao Paolo - Johannesburg
South African Airways
SA222/223 (SAA222/223)
Departs Johannesburg every day at 11.10 (sometimes more than one flight per day, also departing 21.35)
Departs Sao Paolo every day at 18.00 (ditto, with extra flight departing 23.35)
Auckland - Santiago - Auckland
LATAM Airlines
LA800/801
Departs Auckland every day at 18.10
Departs Santiago every day at 00.55
Sydney - Santiago - Sydney
Qantas
QF27/28
Departs Sydney Sunday, Tuesday, Wednesday, Friday at 12.30
Departs Santiago Sunday, Tuesday, Wednesday, Friday at 14.30
Mauritius - Perth - Mauritius
Air Mauritius
MK440/441
Departs Mauritius Tuesday and Saturday at 22.40
Departs Perth Wednesday and Sunday at 13.05
Auckland - Buenos Aires - Auckland
Air New Zealand
NZ30/31
Departs Auckland Sunday, Tuesday, Friday at 20.05
Departs Buenos Aires Sunday, Tuesday, Friday at 23.59
>>>>
So I make that 74 flights every week, and more on occasion.
There may be differences in departure times on certain days, or other flights I'm not aware of. Corrections and additions welcome.