ボタンの長押しを検知するが最初の数秒は無視する

gistfile1.txt

private void Start()
{
    var mouseDown = this.UpdateAsObservable().Where(_ => Input.GetMouseButtonDown(0));
    var mouseUp = this.UpdateAsObservable().Where(_ => Input.GetMouseButtonUp(0));
    this.UpdateAsObservable()
        .Where(_ => Input.GetMouseButton(0))
        .SkipUntil(mouseDown.Delay(TimeSpan.FromMilliseconds(1000)))
        .TakeUntil(mouseUp)
        .Repeat()
        .Subscribe(_ => Debug.Log("aaa"));
}