It depends on the specific situation how long it takes to produce the results after the catering changes are reported to the Environmental Protection Bureau. Generally speaking, the EPA will evaluate the approval time according to the complexity of the application, the completeness of the documents and the requirements of relevant laws and regulations.

Usually, a simple application may take several weeks, while a complex application may take months or even longer. In addition, in the process of approval, on-site investigation and expert evaluation may be needed, which will also affect the approval time.