It's really, really long! From Chicago to Korea (which is so close to china) is about 17.5 hours to 19 hours, depending on the route, weather, plane, etc. On the way back, its about 2 hours less, because you have a tailwind. This is assuming you take a pacific flight, which is 99% of the time.
About 20 hours.
About 14 hours direct flight.
it is about 14h... see http://flighttime-calculator.com/
The flight time from Shanghai, China to Wuhan, China is approximately 50 minutes.
4hours
23 hrs
5 seconds
About 12 hours.
Approximately 15 hours.
6 hours
1 hour and 30 minutes
15 Hours and 13 minutes