Depending on where you are flying from in the US, flight times in to Hong Kong International Airport vary, naturally. For instance, a direct flight from New York to Hong Kong takes around 16 hours, but you can also take a stopover flight to break up the flying time. Alternatively, if you're looking at traveling from China to Hong Kong, a direct flight from Tokyo takes about 5 hours, or you could travel by boat and train.
Hong Kong is known for having comfortable and mild weather for over half of the year - with the summer changing to humid and wet (the rainiest months are generally between June and August). The best time of year to travel is between October to March, where the rainfall is low and the temperatures are cooler.
Hong Kong is located to the South of China. It takes between 3-4 hours for a non-stop flight between Hong Kong and Tokyo.
Hong Kong is a former British Colony, and was handed back to China in 1997. It enjoys a high degree of autonomy from China and is a Special Autonomous Region, meaning that it is a part of China, but governs itself in all matters other than foreign and defence affairs.
The currency of Hong Kong is the Hong Kong dollar.
You can’t use Hong Kong dollars in China, and the currency must be changed into Chinese Yuan. However, you can change your Hong Kong dollars in both Hong Kong and China.