Flight Sydney to Guangzhou / 2 hour layover / Flight Guangzhou to Shanghai / Ship Shanghai to H.K.

Flight arrives Guangzhou 3 PM on Feb 1st. Then a 2 hour stopover in Guangzhou before a flight to Shanghai arriving 7 PM for a two day stay at Holiday Inn. Feb 3rd board approx 2 PM to depart at 5 PM by cruise ship from Shanghai to Hong Kong then other Asian ports.
Can anyone tell me if the 72 hour or 144 hour exemption applies?
Thanks!