Do you have a source for that information? All I can find that it is unknown. Seems strange that it could be unknown unless they don't want us to know. I notice that most other viruses survive much longer than one hour on a clean, dry surface, too.
Here. And bear in mind that Singapore is not a poor country.
S’pore doctor who survived SARS infection shares tips on how to avoid getting Wuhan virus
He stressed the importance of not touching one’s face before washing hands.
Ashley Tan | February 3, 01:58 am
https://mothership.sg/2020/02/leong-hoe-nam-wuhan-virus/