How many years has Rong Zhijian been in prison?

The maximum penalty is imprisonment 14 years.

According to Article 42 of Chapter 1 15 of the Laws of Hong Kong, "False statement, forged document, use and possession of forged document", anyone who makes or causes to be made a statement or representation that he knows is forged or that he does not believe is illegal is liable to a maximum penalty of imprisonment of 14 years. Conspiracy fraud can also be up to 14 years.

If the investigation proves to be true, the maximum sentence for the two crimes can be more than 10 years.