2 sentences

1. 他们已经四十八个小时没睡觉了。

   tā​men yǐ​jīng sì​shí​bā gè xiǎo​shí méi shuì​jiào le.

   They haven't slept for forty-eight hours.

   Source: Tatoeba

2. 警察决定将这名嫌疑人拘留四十八小时。

   jǐng​chá jué​dìng jiāng zhè míng xián​yí​rén jū​liú sì​shí​bā xiǎo​shí.

   The police decided to detain the suspect for forty-eight hours.

   Source: Dong Chinese Dictionary