Full Idea
For Aristotle time is not a process: It is a kind of 'number' or unit that can be used to describe processes in nature, analagous to the way ordinary numbers can be used to count things.
Gist of Idea
For Aristotle time is not a process but a means for measuring processes
Source
report of Aristotle (Physics [c.337 BCE]) by Adrian Bardon - Brief History of the Philosophy of Time 1 'Aristotle's'
Book Reference
Bardon,Adrian: 'Brief History of the Philosophy of Time' [OUP 2013], p.13
A Reaction
Bardon cites this when discussing Aristotle on Zeno's paradoxes. If the equivalent idea of length is that length is merely rulers for measuring it, this sounds like a bad idea. But if processes occur in time, how could time be a process?