Does the 72 hour transit apply ?

My wife and I are flying into Hong Kong at 8:30 pm. We have an 11 hour layover. We'll leave the airport for a few hour to see HK. We fly to Beijing the next morning at 7:30, get to Beijing at 11:00 am.
We fly out two days later to Shanghai on our way back to the USA.
We plan on visiting the Great Wall on our day and a half in Beijing.
Does the 72 hour transit apply?

Thank you