I guess you've already looked at Stocks for the Long Run; you've seen 200 years worth of data.

我想你们已经读过《股市长线法宝》,见过长达200年的数据

耶鲁公开课 - 金融市场课程节选

You know, I've been driving for a long time.

我做司机已经很长时间了。

记忆犹新的乘客 - SpeakingMax英语口语达人

I'm going to give you examples now for how to use "How long."

下面我们来看几个例子，看看该怎么使用 “How long”。

How long课堂 - SpeakingMax英语口语达人

Well according to one school of thought ; there isn't anything particularly revolutionary about monotheism; and the classical account of the rise of monotheism, that has prevailed for a very long time, runs as follows, and I have a little flow chart here to illustrate it for you.

曾经某个思想学派告诉我们,一神论其实没有什么独特的新颖之处;,而它却能飞速崛起，备受重视，盛行了很长一段时间，正如我下面要提到的，我这儿有一些图来帮助你们理解。

耶鲁公开课 - 旧约导论课程节选

What's important about the construction of St. Petersburg-- I don't know how many of you have ever been there; I haven't been there for a very, very long time-- this city is not like Moscow at all.

那么修建圣彼得堡到底有什么重要的意义呢,我不知道你们之中有多少人去过那儿,我并没有在那个地方逗留过很久,但这座城市和莫斯科完全不一样

耶鲁公开课 - 欧洲文明课程节选