You can use this method:
http://docs.unity3d.com/ScriptReference/Collider.OnTriggerEnter.html
To create a simple timer you can use:
float time = 0;
private void Update()
{
time += Time.deltaTime;
Debug.Log(time);
}
ps: For the trigger to work properly you need to attach both collider and rigidbody to the object that is entering the trigger.
As for the trigger itself you just need a collider with trigger enabled.
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