Collision timer help

I have a script, which checks to see if an item, is being hit by another object. Now my question, is there a way to check for how long time, the item and the object has collided? It is to turn off the boolean in the script, if the collision has hit a specific time.

My code.

 static var stickInMotion : boolean = false;
 
 function Update (){
 
 if (stickInMotion == true){
 Debug.Log("StickInMotion == true");
 }
 
 }
 
 function OnTriggerEnter(other : Collider){
 
 if (other.gameObject.tag == "Flipper") {
 stickInMotion = true;
 }
 
 }