A random search for flights from Hong Kong (HKG) to Edinburgh (EDI) shows:
OPTION 1: 16hr 40min via London Heathrow (LHR)
HKG - LHR Cathay Pacific Airways Flt 257 Dep 09:20am 15Jan,Fri
LHR - EDI BMI British Midland Airways Flt 60 Dep 04:30pm 15Jan,Fri
Flight Duration: 15hr 10min; Layover Time: 1hr 30min; Total Trip Time: 16hr 40min
OPTION 2: 16hr 35min via Amsterdam (AMS)
HKG - AMS KLM Royal Dutch Airlines Flt 0890 Dep 12:05am Wed,Thu
AMS - EDI KLM Royal Dutch Airlines Flt 1277 Dep 08:05am Wed,Thu
Flight Duration: 14hr 15min; Layover Time: 2hr 20min; Total Trip Time: 16hr 35min
Flight time from Hong Kong to Phnom Penh is 2:40 hours.
It is about 7 hours flying time from Hong Kong to Darwin
The flight time from Karachi, Pakistan to Hong Kong averages 5 hours, 58 minutes.
The flight time from Hong Kong to Osaka is 3.5 hours. The flight distance is 1,549 miles (2,493 kilometers or 1,346 nautical miles). Osaka's time zone is one hour ahead of Hong Kong's time zone.
The flight time from Hong Kong to Mauritius is about 9 hours, 38 minutes.
10hrs
The flight time from Hong Kong to Frankfurt, Germany is about 11 hours, 24 minutes.
The flight time from Africa to Hong Kong is about 12 hours, 28 minutes.
A nonstop flight from Hong Kong to Seoul would be about three hours and 35 minutes.
The flight time is 12 hours.
2hr 35min Hong Kong (HKG) to Phnom Penh (PNH) by a nonstop flight operated by Dragonair.
Hong Kong is a city in China. You would have to provide the name of the other city to calculate flight time.