How do I have the user fast tap on an AR object 10 times (in a certain amount of time) in order to trigger an animation?

The main idea of my game is to have a floating AR object. I want the user to fast tap on the object a certain number of times (ex. Tap 10 times) to trigger an animation. I'm pretty sure that the idea is to count the number of Raycast hits on the object in a certain amount of time. But I don't know how to do that. (Using Vuforia)

Here is the code I have so far. All it does at the moment is plays a particle animation with sound when the ball is tapped on the iphone screen (AR).

 public void Update()
     {
 
 
 
         if (Input.GetMouseButton(0))
         {
             Vector3 mousePosFar = new Vector3(Input.mousePosition.x, Input.mousePosition.y, Camera.main.farClipPlane);
             Vector3 mousePosNear = new Vector3(Input.mousePosition.x, Input.mousePosition.y, Camera.main.nearClipPlane);
 
             Vector3 mousePosF = Camera.main.ScreenToWorldPoint(mousePosFar);
             Vector3 mousePosN = Camera.main.ScreenToWorldPoint(mousePosNear);
             //Debug.DrawRay(mousePosN, mousePosF - mousePosN, Color.green);
 
 
             RaycastHit hit;
 
 
 
 
 
             if (Physics.Raycast(mousePosN, mousePosF - mousePosN, out hit))
             {
 
 
                 //Plays cartoon punch sounds when ball is tapped
                 moneyhitsounds = GetComponent<AudioSource>();
                 //int ran = Random.Range(0,5);
                 moneyhitsounds.clip = hitsounds[0];
                 moneyhitsounds.Play();
 
 
 
                 //Plays the dollar bill animation when moneyball is tapped
                 collectParticle.Play();
 
             }
         }
 
     }