For long hours he flew, listening only to the sound of his engine.

VOA: special.2009.03.18

so for about six, oh, no, it was nine hours a day, it's a long time ago.

每天要上六个，噢，不是，是九个小时的课，这都是很久以前的事情了。

纽约的人们 - SpeakingMax英语口语达人

You might have to stay away from low-lying areas for as long as twenty hours after the first warning.

VOA: special.2011.06.07

He remembered the long dinners where he had to talk to his wife's friends for hours.

VOA: special.2010.05.29

They did not protest working long hours for low pay.

VOA: special.2010.05.20

Black women worked very long hours for little wages.

VOA: special.2010.03.28