How long does it take to cruise from Shanghai to Nagasaki, Japan?

26 hours. By querying Google Maps, I learned that the straight-line distance from Shanghai to Nagasaki, Japan by cruise ship is 800 kilometers and it is expected to take 26 hours. Shanghai, referred to as "Shanghai", is a municipality directly under the Central Government of the People's Republic of China, a national central city, a megacity, and the core city of the Shanghai metropolitan area.