Travelling from MEX-PVG-BKK-PVG-MEX, both layovers in Shanghai are less than 72hr

My flights are Mexico City - Shanghai (2 day layover), Shanghai - Bangkok and then Bangkok - Shanghai (another two day layover) and Shanghai - Mexico City.
Does this itinerary makes me ellegible for the 72hr free transit policy at Shanghai for the two layovers?
I will be at Bangkok for less than a week

Thanks