My airline is China Eastern and makes two stopovers in PRC in our way to Cambodia.

Am I entitled to a 72hr free transit?
Arrival in Shangai March 6th at 6:10AM
Shangai - Kunming at 00:50
Kunming- Siem Reap (Cambodia) March 7th at 20:15

I have the tickets and confirmed seats in both flights.
Many thanks.
Patricia Aguilar