I see.
But I found even they don't start the timer at the same time, when "on timer" event is triggered, C2 still picks the same instance. You must add your own logic to check whose time is up.
Is't it convenient to have each instance to have its own on timer event like "on destroy" or "on create" which references the instance who triggers the event?
Tag maybe is a solution .But if you have many many instances, you must maintain so many "on timer" event even they all do the sam thing.