One and a half hours are allowed for the exam.

考试时间为一个半小时。

《牛津词典》

There are still one and a half hours to go , we needn't be insuch a hurry .

还有一个半小时，我们无需如此慌慌张张。

youdao

"A hummingbird can hover like a helicopter for one and a half hours, nonstop," Dr. Tobalske said.

“蜂鸟能像直升机一样悬停，且时间可以长达一个半小时，中间不间断，”托巴尔斯克说。

youdao

On average, each adolescent reported using some kind of media five and one-half hours a day.

VOA: special.2009.03.10

Media use totaled an average of five and one-half hours a day.

VOA: special.2009.02.11

He announced the debate would be held the following day, on 20 March, and would last for one and a half hours.

BBC: Labour granted emergency debate on NHS Bill

In Japan already, you can sell cell phones as e-mail terminals because people are standing in lines in trains for one and a half hours.

CNN: Will Java and Jini be in everything?

After one and a half hours at Gumu Shea not one member of our group was standing anywhere near the bus, bored and ready to depart.

FORBES: Smart Phones and Mobile Devices Create Smooth Transactions in Rugged Terrain