我找了个正确的,移民局网站上有公布的,从2014年3月24日生效
Upon application principal applicants, except for those to whom RV2.10 applies, will be granted a permanent resident visa if:
they either:
hold a resident visa, and have held that resident visa continuously for at least 24 months at the time of application; or have held a resident visa in the three months before the application is made, and had held that resident visa continuously for at least 24 months before it expired; and
前半句和后半句都说了必须是在申请PRV之前或RV到期前的24个月,也就是说是后2年啦~~~~~
at least 24months at the time of application这里的申请是你PRV的申请。