What is the flying time from New York to Rotterdam Netherlands?

Amsterdam (AMS) to Sydney (SYD)

Shortest Flight Duration * 21 hours 15 mins * Via Bangkok Suvarnabhumi International Apt, Bangkok (BKK)

or

Amsterdam (AMS) to Perth (PER)

Shortest Flight Duration * 20 hours 15 mins * Via Singapore Changi Apt, Singapore (SIN)