Wǒ yǐjīnɡ 48 ɡè xiǎoshí méi shuìjiào le.
我已经48个小时没睡觉了。
I haven't slept for 48 hours.
Notes:
我(wǒ): I
已经(yǐjīnɡ): already
个( ɡè): measure word
小时(xiǎoshí): hour
没(méi): didn't
睡觉( shuìjiào): to sleep
了(le): particle word
Example:
A:我已经48个小时没睡觉了
Wǒ yǐjīnɡ 48 ɡè xiǎoshí méi shuìjiào le.
I haven't slept for 48 hours.
B:真可怜。
Zhēn kělián.
So poor.