Though a definite and clear answer can not yet be given, there are some results of studies and I have found the following answers.
Plastic and stainless steel: 72 hours | Studies have shown that the COVID-19 virus can survive for up to 72 hours on plastic and stainless steel
on copper: less than 4 hours
on cardboard: less than 24 hours
The most important thing to know about coronavirus on surfaces is that they can easily be cleaned with common household disinfectants that will kill the virus.
As, always clean your hands with an alcohol-based hand rub or wash them with soap and water. Avoid touching your eyes, mouth, or nose.
Source: WHO, BBC, NIH, ECDC