during one's time
没有固定的时态。因为during her lifetime可能是过去（结束了）也可能是现在（还没结束），也可能是将来。看句子意义决定。
例子：（来自百度翻译）
Say's writings reached a wide audience during his lifetime. 过去时
塞伊的作品在他有生之年就拥有了广泛读者。
来源：《柯林斯英汉双解大词典》
He suggested that the environment has changed during his lifetime.完成时
他表示，在他的一生中，环境发生了变化。
My uncle accepted that Shaws belonged to me, but he would stay there during his lifetime. 过去将来时
我叔叔同意肖家大院归我所有，但他要待在那儿度过余生。