A random search from Singapore (SIN) to Los Angeles (LAX) shows:
OPTION 1: 17hr 55min via Tokyo Narita (NRT)
SIN - NRT ANA Flt 112 Dep 08:15am 03 Sep,Fri
NRT - LAX ANA Flt 006 Dep 05:10pm 03 Sep,Fri
Flight Duration: 17hr 05min; Layover Time: 0hr 50min; Total Trip Time: 17hr 55min
OPTION 2: 20hr 15min via Manila (MNL)
SIN - MNL Philippine Airlines Flt 508 Dep 02:50pm 03Sep,Fri
MNL - LAX Philippine Airlines Flt 102 Dep 10:00pm 03Sep,Fri
Flight Duration: 16hr 50min; Layover Time: 3hr 25min; Total Trip Time: 20hr 15min
To Fly from singapore to kathmandu it would take about 5-6 hours.
it depends.
14hours
If you fly direct it would take about 11 hours.
Fm Singapore to Penang - a mere hour.
10000 years
99 hours
with in 3hrs
8h
It would take 4 hours.
It would take 18 hours.
about 12 to 13 hrs