The length of the audio clip in samples. (Read Only)

// Prints how many samples the attached audio source has	
function Start() {
    Debug.Log(audio.clip.samples);
}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void Start() {
        Debug.Log(audio.clip.samples);
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def Start() as void:
		Debug.Log(audio.clip.samples)