2 sentences

1. 这种活动很消磨时间。

   zhè zhǒng huó​dòng hěn xiāo mó shí​jiān.

   This kind of activity is a real time-killer.

   Source: Dong Chinese Dictionary

2. 只是随便读读消磨时间罢了。

   zhǐ​shì suí​biàn dú dú xiāo​mó shí​jiān bà​le.

   It's just some reading to pass the time.

   Source: OpenSubtitles