zhè jù huà ràng bié rén bù yòng wèi le lǐ mào yī zhí kōng děng, yě biǎo shì nǐ lǐ jiě dà jiā shí jiān

这句话让别人不用为了礼貌一直空等，也表示你理解大家时间。

This sentence lets others not have to wait around out of politeness, and also shows that you understand everyone's time.