title: Angular2 Observable Timer Condition
body: <p>I have a timer:</p>
  
  <pre><code>initiateTimer() {
      if (this.timerSub)
          this.destroyTimer();
  
      let timer = TimerObservable.create(0, 1000);
      this.timerSub = timer.subscribe(t =&gt; {
          this.secondTicks = t
      });
  }
  </code></pre>
  
  <p>How would I add the condition to after 60 minutes present a popup to the user? I've tried looking at a couple of questions (<a href="https://stackoverflow.com/questions/34728827/rxjs-if-with-observable-as-conditional">this</a> and <a href="https://stackoverflow.com/questions/42557993/how-do-i-stop-observable-timer-or-observable-interval-automatically-after-ce">this</a>) but it's not clicking for me. Still new to RxJS patterns...</p>