Five hours after the explosion, flight controllers advised firing the rocket for thirty-five seconds.

VOA: special.2009.07.22

And she has to catch a flight, and you know the flight is going to leave in three hours and she's taking her time.

她马上得去赶飞机，你知道飞机在三个小时后就要起飞了。可她还在磨磨蹭蹭。

Make sure 课堂 - SpeakingMax英语口语达人

At the site of the crash, investigators spent hours combing through the mangled remains of the aircraft to find the plane's black box, flight-data recorder.

VOA: standard.2010.05.23