Fly in march : Vie - kanton - hanoi

Hi, in march i fly with China Southern from Vienna to Hanoi. My fly is 14.3. From Vienna - then i have technical stop 15.3. in Urumchi 2,5 hours (CZ6022) and then i have stop in Kanton 23 hours (CZ8315) and then i go to Hanoi. Together it is 25,5 hours and 1 technical stol and 1 transfer stop. Can i have 72-hours-free visa? Thank you.