title: How to make a stopwatch that takes a widget off the air?
body: <p>I need to know how to make this stopwatch, which after 48 hours disables a widget, which in my case is a button. Can someone explain to me how to do it? What classes to use?</p>
  
  <p>I tried to use this, but don't works: </p>
  
  <pre><code>var timer = Timer(Duration(seconds: 1), () =&gt; print('done'));
  </code></pre>