如果是continue,应该是continue for three months.比如,Wet weather may continue for a few more days.多雨的天气可能还要持续好几天.
而stretch常和over 搭配,表示延伸了多少距离,面积,时间等.比如：
Of the 27 NZ mountains that stretch over 3050m high,22 are in this park.
在新西兰27座高度超过3050米的山峰中,有22座位于该园之内.Transplanting will stretch over 20 days.
插秧要进行20多天