The residence requirement is based on the time you have lived in Australia and the time you have spent outside Australia. You must:
have been living in Australia on a valid Australian visa for four years immediately before applying which must include the last 12 months as a permanent resident, and
not have been absent from Australia for more than one year in total, in the 4 year period, including no more than 90 days in the year before applying.
but for example if like us, used to hold student visa, then only need to wait for One year after you have your PR, then you can apply citzenship, of course assume staying in australia long than 4 years in total ^^