75 hours in Shanghai

I am an Australian living in Paris and will be traveling to Shanghai for 3 days (on my way to Australia). I land in Shanghai on 18 December at 5:40pm and fly out of Shanghai on 21 December at 8:20pm - this means I will be in the country for approximately 75 hours. Does this pass with the 72 hour free transit or do I need to apply for a 3 month holiday visa?