How to use Spine. Animation.Duration modify the length of the animation using the state machine(SkeletonMecanim). I want to move the frame back to make the animation longer. Although I can modify the value of the frame and make it work, I can't modify the length of the entire animation
Here are more details of the code

public SkeletonMecanim skeletonMecanim;
   public Animator animator;

   protected Skeleton skeleton;
   protected SkeletonData skeletonData;
   protected Spine.Animation moveAnimation;

   void Start()
   {
       skeletonMecanim = GetComponent<SkeletonMecanim>();
       animator = GetComponent<Animator>();
       skeleton = skeletonMecanim.skeleton;
       skeletonData = skeleton.Data;

   //get animation , because there are only 1 animation and only 1 timeline so i write like this
   foreach (Spine.Animation animation in skeletonData.Animations)
   {
       moveAnimation = animation;
   }

   //look at this！
   //This does not take effect. The length is still the original length
   moveAnimation.Duration = 10;

   //get TranslateTimeline
   TranslateTimeline translateTimeline = null;
   foreach (Timeline timeline in moveAnimation.Timelines)
   {
       translateTimeline = timeline as TranslateTimeline;
   }

   //The moving value of this frame has been successfully changed,
   //but the animation length still remains unchanged
   //why and how to deal with this orzzzzzzzz
   translateTimeline.SetFrame(1, 10, 50, 60);



   }

So what's the problem ）））