Just because emails are a quick form of communication, it doesn't mean emails, especially business emails, should be written using informal, shortened forms of words.
2018年12月四级真题(第二套)听力 Section C
英语六级真题
The workers' pay was raised and their working hours were shortened.
出自-2010年6月听力原文
柯林斯高阶英汉双解学习词典释义
V-ERG
(使)时间变短;缩短(…的时间)
If you shorten an event or the length of time that something lasts, or if it shortens, it does not last as long as it would otherwise do or as it used to do.