The premise of entering the substantive examination is that the applicant shall make a request for substantive examination within five years from the date of application (when claiming priority, it means from the earliest priority date), otherwise the patent application will be regarded as withdrawn. If the applicant fails to make a request for substantive examination within 4 years from the priority date, the Australian Patent Office will usually notify the applicant to make a request for substantive examination, and the applicant shall make a request for substantive examination within 6 months from the date of receiving the notice.
The time required for the substantive examination procedure will depend on the case examination pressure of the Australian Patent Office, which is usually about 2 years. The applicant may request accelerated examination, but shall pay the request fee for accelerated examination in accordance with the regulations.