Will the 72 hour rule work for me? Jason from the United States

I'm flying to Shanghai June 25th 2014 and staying for 2 days, then taking a air asia flight to Manilla on the 27th of June. Then July 11th I'm heading back home by taking a Flight back to Shanghai to catch my return Delta flight to Detroit , only staying for 24 hours to catch my return flight. During my stay for 2 days on first arrival I want to take a paid tour of Shanghai. Will the 72 hour no Visa exception work for me. Mind you I will not be in China longer then 72 hours on either of my stops there.