timescale
noun [ C ] uk/ˈtaɪm.skeɪl/ us/ˈtaɪm.skeɪl/
（某事发生的）一段时间，起止时间
the period of time over which something happens
Police officers are trying to construct the timescale of events leading up to the murder. 警方正在努力把谋杀前发生的事件按时间顺序排列出来。
What's the timescale for this? (= How long will it take?) 这要持续多久？