Malaysian airways used to have deal where if you flew transpac to KL, you could for a small additional fee fly onward to any other destination. So I went to South Africa. The routing back was
CPT-JNB-KUL (6 hour morning stop in airport hotel with pool)-can't even remember-LAX-YYZ-YXU.
56 hours door to door
(ok, doesn't quite meet the OP's criteria, but still...)