timescale
time scale |ˈtīmˌskāl ˈtaɪmskeɪl | ▶noun the time allowed for or taken by a process or sequence of events: climatic changes on a timescale of thousands of years.
time |scale |ˈtʌɪmskeɪl | ▶noun the time allowed for or taken by a process or sequence of events: climatic changes on a timescale of tens of thousands of years.