Thanks for the correction. Here's my revised itin:

CAI-LHR-GIB
SVO-HEL-PEK
PEK-HKG-DEL
DEL-HKG
HKG-SIN
SIN-SYD
SYD-NOU
NOU-BNE
BNE-MEL
MEL-AKL
AKL-SCL
SCL-UIO
UIO-SCL-EZE
EZE-GRU
GRU-LHR-DXB

I stretched it to the max, 4x4 intra-cont + 4 inter-cont = 20 segments total.

Is this itin now legal?