var foo : AudioSource;

function Update () {

    if (!foo.isPlaying && Time.time >= 60) {
       foo.Play();
    }
}

Simple as that. ;)

Hope that helps, Klep

You can use coroutines. Following code is in C#, but JS is quite similar.

IEnumerator PlaySoundAfterDelay( AudioSource audioSource, float delay )
{
    if( audioSource == null )
        yield break;
    yield return new WaitForSeconds( delay );
    audioSource.Play();
}

And to use it, you just need to start the coroutine:

public AudioSource myAudio;

void Start()
{
    StartCoroutine( PlaySoundAfterDelay( myAudio, 60.0f ) );
}