Regarding 72-hour Free Transit

I am going to flight from Korea to Sydney through Guangzhou and then back to the Korea through Guangzhou from Sydney after 2 weeks. I am going to flight from the Korea and arriving at Guangzhou on Saturday at 12:05 pm . Then I am leaving Guangzhou on Monday at 08:20PM (less then 72 hours) to Sydney. After 2 weeks, I am going to flying back to the Korea from Sydney through Guangzhou. I am eligible for the 72-hour Free Transit in Guangzhou when I go to Sydney from Korea?