      *  The length of time, in milliseconds, of the animation,
      *  not counting any repetitions defined by 
      *  the <code>repeatCount</code> property.
-     *  
-     *  @langversion 3.0
-     *  @playerversion Flash 10
-     *  @playerversion AIR 1.5
-     *  @productversion Flex 4
-     */
-    public var duration:Number;
+     * 
+     * @default 500
+     *  
+     *  @langversion 3.0
+     *  @playerversion Flash 10
+     *  @playerversion AIR 1.5
+     *  @productversion Flex 4
+     */
+    public var duration:Number = 500;
 
     //----------------------------------
     //  repeatBehavior

import spark.effects.interpolation.ArrayInterpolator;
import spark.effects.interpolation.IInterpolator;
import spark.effects.interpolation.NumberInterpolator;

[DefaultProperty("motionPaths")]


import flash.utils.Timer;
import flash.utils.getTimer;

import mx.core.mx_internal;
import mx.events.EffectEvent;
import mx.resources.IResourceManager;
import mx.resources.ResourceManager;

import spark.effects.KeyFrame;
import spark.effects.SimpleMotionPath;
import spark.effects.easing.IEaser;
import spark.effects.easing.Linear;
