Others last for months or even years. There is no clear way of predicting at the present time how long this activity might go on for."

VOA: standard.2010.04.16

I was going to say when you first start doing this, even people who have been doing it for a long time still go off on ten-minute daydreams before realizing that their minds were wondering.

我本想说第一次尝试时，但即便是修行多年的人,也会走神十分钟之久,方才意识到自己刚做了白日梦。

普林斯顿公开课 - 人性课程节选

If he's going to sit there on one chord for that amount of time, it's going to go on for a long period of time.

既然作曲家能放任一个和弦行进这么久，他一定有的是时间。

耶鲁公开课 - 聆听音乐课程节选