UnityEditor.AnimationClipEditor.GetClipLength C# (CSharp) Method

        private float GetClipLength()
        {
            if (this.m_ClipInfo == null)
            {
                return this.m_Clip.length;
            }
            return ((this.m_ClipInfo.lastFrame - this.m_ClipInfo.firstFrame) / this.m_Clip.frameRate);
        }