Anders Wilhelmson says the sanitation process can take as little as a couple of hours or as long as two to four weeks.

VOA: special.2010.03.15

In William James, maybe the case-- because the elevator-- it does take two hours to get there for the door to close.

在William，James大厅也许会遇到这种事-,因为那部电梯-,运作得太慢。

哈佛公开课 - 幸福课课程节选

Let's create a graph here that on the x axis it's going to be time, so time zero will be when you first take in a food and then one hour later, two hours later will be shown as you go from left to right, and then we'll have blood glucose level up on the y axis.

我们在这建立一个曲线图,X轴代表的是时间,所以零时间点是你第一次进食的时间,然后一小时以后,两小时以后,是从左到右呈现在图表上的,在Y轴上是你的血糖值

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

It can take from twenty minutes to more than two hours for them all to leave.

VOA: special.2009.12.07