Get real clip duration with animatior state speed changed

Unity Engine
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1

Hello,
i have the follow script to get the clip duration:

public static float GetClipDuratin(this Animator animator, int clipHash)
    {

        foreach (AnimationClip clip in animator.runtimeAnimatorController.animationClips)
        {
            AnimatorControllerLayer layer = (animator.runtimeAnimatorController as AnimatorController).layers[0];
            foreach (ChildAnimatorState state in layer.stateMachine.states)
            {
                if (Animator.StringToHash(clip.name) == clipHash)
                    return clip.length / state.state.speed;
            }
        }
        throw new Exception($"There is not clip with Hash: {clipHash} in the animator {animator.name}");
    }

I’m having an issue where my code only works in the Unity Editor because it relies on UnityEditor.Animations. I’m using this since I often change the speed of states in the Animator, and it’s the only method I’ve found to get the real-time clip duration. Is there another way to retrieve the clip duration if I change the speed in the Animator state?