title: Repeatedly make API call with retrofit and rxjava
body: <p>I have a retrofit observable: </p>
  
  <pre><code>@GET("something/")
  Observable&lt;Something&gt; getSomething();
  </code></pre>
  
  <p>subscribing to it gives the response.</p>
  
  <pre><code>getSomething().subscribe(new Subscriber&lt;Something&gt;() {
              @Override
              public void onCompleted() {
              }
  
              @Override
              public void onError(Throwable e) {
              }
  
              @Override
              public void onNext(Something something) {
                  //update database of something
              }
          });
  </code></pre>
  
  <p>how can i make this call every 60 seconds so that i can update database accordingly?</p>