How long is the fastest backdoor listing?

Backdoor listing means that a company obtains a certain degree of controlling right by injecting assets into listed companies with low market value, and uses its status as a listed company to list the assets of its parent company. Usually shell companies change their names. The time required for backdoor listing is irregular. Generally, the first thing a backdoor company does is to collect the chips of the backdoor company and realize absolute holding (the more the better). This time is very long and hidden. Then go to the CSRC for backdoor procedures, followed by a series of approval procedures of the CSRC. It will take at least six months, at least one year, or longer for these programs to go on the market again.