Checking total duration of the animation with TweenMax.js

An example of checking total duration of the animation with TweenMax.js. 
<!DOCTYPE html>
<html>
<head>
    <script src="js/plugins/BezierPlugin.min.js"></script>
    <script src="js/easing/EasePack.min.js"></script>
    <script src="js/TweenMax.min.js"></script>
</head>
<body>
<button id="seekBut" onclick="seekAnimation()">Check total duration of the animation</button>
<br>
<canvas id="myCanvas" width="700" height="300"></canvas>
<div id="textDiv"></div>
<script>
    
var txtdiv = document.getElementById('textDiv');
var context, canvas, myRectangle, tween;
    
    canvas = document.getElementById('myCanvas');
    context = canvas.getContext('2d');

  function drawRectangle(myRectangle, context) {
      
        context.beginPath();
        context.rect(myRectangle.x, myRectangle.y, myRectangle.width, myRectangle.height);
        context.fillStyle = '#00ff00';
        context.fill();
        context.lineWidth = myRectangle.borderWidth;
        context.strokeStyle = 'black';
        context.stroke();
    
  }
  
  function renderCanvas() {
      
        context.clearRect(0, 0, canvas.width, canvas.height);
        drawRectangle(myRectangle, context);
      
  }
    
  myRectangle = {
      
        x: 10,
        y: 100,
        width: 50,
        height: 50,
        borderWidth: 5
      
  };
    
  function seekAnimation() {
    
  
        var td = tween.totalDuration()
      
        txtdiv.innerHTML = "total duration = " + td;
    
  }

    
// creating a tween as a variable
tween = new TweenMax(myRectangle, 5, {x:"+=300", y:"+=100", width:50, height:50, borderWidth: 5, onUpdate:renderCanvas });    
tween.play(); // playing the tween
    
</script>
</body>
</html>
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