LAX-SIN-JNB-GRU-LAX
So, I went looking and found it can be ticketed on Singapore Airlines + Varig for 11000 USD in Business (or 10000 in coach, easy choice)...
50 hours in the air, 18+12 + 10 + 10.. fare codes
SQ LAX-SIN ZSQ fare
YY SIN-JNB C fare
RG JNB-LAX C fare