The timing of rejection in the Patent Examination Guide refers to

After the patent application is rejected, it takes three months to apply to the patent office for reexamination. The patent reexamination procedure is exclusive to the patent applicant, and the reexamination application shall be submitted to the Patent Reexamination Board of the State Intellectual Property Office. The patent reexamination procedure includes four stages: formal examination, preliminary examination, collegiate examination and reexamination decision.