J1 豁免 USCIS处理时间

同学们，我最近uscis 网站上查到我的J1 豁免的状态是"Case Was Received At Another USCIS Office" 请问同学们大概多久会approve case啊。因为还有三个月就搬家了， 我怕收不到这个waiver。谢谢大家