How long is the flight between Hong Kong to Nepal?

A random search for flights from Hong Kong (HKG) to Kathmandu (KTM) shows:

OPTION 1: 4hr 50min Nonstop

HKG - KTM Royal Nepal Airlines Flt 410 Dep 05:00pm 17Jun,Thu

Flight Duration: 4hr 50min

OPTION 2: 9hr 50min via Bangkok (BKK)

HKG - BKK Cathay Pacific Airways Flt 713 Dep 08:55am 18Jun,Fri

BKK - KTM Royal Nepal Airlines Flt 402 Dep 02:20pm 18Jun,Fri

Flight Duration: 6hr 05min; Layover Time: 3hr 45min; Total Trip Time: 9hr 50min