当一个人说“该走的时候”，他/她的意思是该离开的时候到了。这个短语来自于英语中常用的说法“it's time to go”，意思是该离开了。例句如下：
It's getting late. I think it's time to go.
The movie is over. It's time to go home.
I've been here for two hours. I think it's time for me to go.
中文翻译如下：
已经很晚了。我认为该走了。
电影放完了。该回家了。
我已经在这里待了两个小时。我认为我该走了。