关于PR转CITIZEN的疑问

现在已经变成每12个月一续了吧。
4 years lawful residence in Australia. This period must include 12 months as a permanent resident immediately before making an application for Australian citizenship
and
absences from Australia of no more than 12 months in total in the 4 years prior to application, including not more than 90 days in the 12 months immediately prior to application.
我也想知道，之前回国了4年，如果时间从新开始算了。那我到底是要3年还是4年，如果我都不回国的话？