A random search for flights from Singapore (SIN) to Auckland (AKL) shows:
OPTION 1: 11hr 35min via Melbourne (MEL)
SIN - MEL Emirates Airlines Flt 404 Dep 10:25pm 13Nov,Fri
MEL - AKL Air China Flt 5149 Dep 09:30am 14Nov,Sat
Flight Duration: 10hr 50min; Layover Time: 0hr 45min; Total Trip Time: 11hr 35min
OPTION 2: 12hr 40min via Kuala Lumpur (KUL)
SIN - KUL Malaysia Airlines Flt 616 Dep 07:10pm 13Nov,Fri
KUL - AKL Malaysia Airlines Flt 131 Dep 09:30am 13Nov,Fri
Flight Duration: 11hr 20min; Layover Time: 1hr 20min; Total Trip Time: 12hr 40min
46 hours
2 Hours
About 11 hours
The flight time from Barcelona, Spain to Singapore is about 13 hours, 31 minutes.
The flight time from Cairns, Australia to Singapore is about 6 hours, 15 minutes.
13 hours
Around 20 hours.
The flight time from Seoul, South Korea to Singapore is about 5 hours, 47 minutes.
14 hours
12 hours 25 minutes
5 hours 51 minutes
For direct flights, about 1.5 to 2 hours flying time. This is time 'in the air' and excludes ground activities.