paris sydney via shangai

Good afternoon

I have a fly to Sydney from paris via Shangai on the december 21, 2017

the return the same route with the stop also at Shangai airport on the Jannuary 09, 2018 (only 5 hours max in shangai during transit)

so about 20 days later
Do I need two visa free transit?
Could you help me please?
Thanks a lot
Christophe