In 1981 children in the United States spent an average of slightly less than two and a half hours a week doing household chores; by 1997 they had spent nearly six hours a week.

1981年，美国儿童平均每周花在家务上的时间略少于两个半小时；到1997年，这个时间达到近6个小时。

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When he comes back two and a half hours later, they're still staying in the same place, continuing the same conversation on the same topic.

当他两个半小时后回来时，他们还在同一个地方，继续就同一个话题进行着同样的谈话。

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Passengers will pay two hundred thousand dollars to ride to outer space and back for two and a half hours.

VOA: special.2009.12.18

And if you are prepared to stand up for about two and a half to three hours to watch a play,

而且你要准备好了站上大约两个半小时到三个小时，去看一场戏剧，

莎士比亚环球剧院 - SpeakingMax英语口语达人

So I could do that in probably two and a half hours.

我可以用大约两个半小时的时间走完这段路程。

旧金山的公共交通 - SpeakingMax英语口语达人

And I close as I opened two hours ago -- two and a half hours ago -- William Jefferson Clinton is not guilty of the charges that have been brought against him.

CNN: Transcript: White House Counsel Ruff's opening statement

My wife, who works on the Guardian newspaper, set off on foot to make the one and a half miles to her office, and it took her two and a half hours 'cause she was constantly being directed further and further north.

NPR: Novelist Ian McEwan: Attacks Resulted in Solidarity

Ranger and Velsheda raced for two and a half hours in Antigua last year and crossed the finish line within five seconds of each other.

FORBES: Magazine Article