一个半小时用英语表达是：one and a half hours；

half：n. 一半; 半; (比赛、音乐会等的)半场，半局; (啤酒等饮料的)半品脱。

hours：n. 小时; 约一小时的时间; (工作、办公等的)固定时间。

相关介绍

It often takes me one and a half hours to finish my homework.

我常常花费一个半小时的时间来完成我的功课。

Laying down: Corkage around one and a half hours to drink the best.

最佳饮用时间：开瓶一个半小时饮用最佳。

The session will last for about one and a half hours, and end about11pm.

每堂讨论课为时一小时半，大概会在11点结束。

There are still one and a half hours to go, we neednt be in such a hurry.

还有一个半小时，我们无需如此慌慌张张。

She arrived one and a half hours late and spun ( me) a yarn about her being ill.

她迟到一个半小时，然后对我撒谎说她病了。