How long has the player tapped on the iOS/Android display screen? How can I measure the time?

Question

In my game the player needs to tap on the iOS/Android display screen to make a gameplay action. I want to find out how long the player pressed his finger against the display screen. For example, if the player pressed his finger 1 second on the screen than I could make a different or stronger action when the tap gesture is finished. I thought maybe I could multiply the time of the tap gesture with another value to determine the strength of a gameplay action in my game.

For example: Strength of gameplay action = xx seconds * 1000

But I don´t know how to measure the time that the finger was on the screen. How can I measure the time of the tap gesture?

  TouchPanel.EnabledGestures = GestureType.Tap | GestureType.FreeDrag | GestureType.DragComplete;

  while (TouchPanel.IsGestureAvailable)
  {
      GestureSample gs = TouchPanel.ReadGesture();
      switch (gs.GestureType)
      {
          case GestureType.Tap:
          //  Strength of gameplay action = xx seconds * 1000  ?

          break;
          case GestureType.FreeDrag:

          break;
          case GestureType.DragComplete:

          break;
     }
 }

Answer

I use the following code to get the touch began and touch end:

DateTime TapCurrentTimeUTC;
DateTime TapReleasedTimeUTC;
TimeSpan TapRemainingTimeUTC = TimeSpan.Zero;

protected override void LoadContent()       
{             
    _spriteBatch = new SpriteBatch(GraphicsDevice);  
    TouchPanel.EnabledGestures = GestureType.Tap | GestureType.FreeDrag | GestureType.DragComplete;          
}          

protected override void Update(GameTime gameTime)        
{              
      Touchcollection = TouchPanel.GetState();
      if (Touchcollection.Count > 0)
      {
          if (Touchcollection[0].State == TouchLocationState.Released)
          {
              TapReleasedTimeUTC = DateTime.UtcNow;
              TapRemainingTimeUTC = TapReleasedTimeUTC - TapCurrentTimeUTC;                   
          }
          
          if (Touchcollection[0].State == TouchLocationState.Pressed)
          {
              TapCurrentTimeUTC = DateTime.UtcNow;
              TapRemainingTimeUTC = TimeSpan.Zero;            
          }   
      }

    base.Update(gameTime);        
} 

while (TouchPanel.IsGestureAvailable) 
{ 
    GestureSample gs = TouchPanel.ReadGesture(); 
    switch (gs.GestureType) 
    { 
        case GestureType.Tap: 
            // Then I use 
        break; 
        case GestureType.FreeDrag: 

        break; 
        case GestureType.DragComplete: 

        break; 
    } 
}

When I tap on the display screen the Touchcollection State is TouchLocationState.Pressed and when I don´t touch the display anymore then the Touchcollection State is TouchLocationState.Released.

TapRemainingTimeUTC is the duration of the tap on the display screen.

Afterwards case GestureType.Tap is executed and I use TapRemainingTimeUTC there.

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How long has the player tapped on the iOS/Android display screen? How can I measure the time?

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