[Unity] Get length of animation

Animator animator = GetComponent<Animator>();
float time;
RuntimeAnimatorController ac = animator.runtimeAnimatorController;    //Get Animator controller
print (ac.animationClips[0].length);


OR

Animator animator;
AnimatorClipInfo[] clipInfo = animator.GetCurrentAnimatorClipInfo(0);
float animationLength = clipInfo[0].clip.length;