Cruise from Shanghai to Sydney Australia - will we be fine?

A once in a lifetime cruise so we don't want to make any mistakes. Our flight arrives on a Monday (14:00) in Shanghai and we depart on a Princess Cruise the Friday. So by my calculations, the 144 hours begin at 0:00 Tuesday. The cruise leaves Shanghai at 18:00 Friday (which would be 114 hours) and then we are at sea (traveling) until Sunday arriving in Busan, South Korea. Leaving South Korea and back at sea for 2 full days arriving in Hong Kong, China on the Wednesday for a day. Then leaving Hong Kong that same night on route to Vietnam.

So its follows the following pattern:
-Toronto-Shanghai (stay 120 hours)
-At sea 2 days
-South Korea (10 hours)
-At sea 2 days
-Hong Kong, China (15 hours)
- At sea 1 day
- Vietnam ..... Sydney 13 days later

I don't mind doing a multi-day visa just to be safe but finding this 144 hour visa information on your page has given me some other options. Which is the safer option?

Thanks