Could you please confirm that a double entry visa would be sufficient for our needs.

My wife and I are booked on a cruise sailing from Shanghai on 4 March. We are flying into Shanghai on 2 March, staying overnight in a hotel then boarding the ship on 3 March. We plan to do an excursion in Shanghai on 4 March prior to the ship sailing and have therefore applied for a double entry. The ship is not calling into any other Chinese ports during the rest of the cruise.