title: symfony2 session lifetime
body: <p>I had a problem with symfony2 session component. I set some data to session through session container like this:</p>
  
  <pre><code>$sess = $this-&gt;get( 'session' );
  $sess-&gt;set( 'some_key', 'some_value' );
  </code></pre>
  
  <p>But after a little bit of time (about 15-20 minutes) the session got lost.</p>
  
  <p>Can I set session life time parameter? The perfect variant for me would be if I can set certain time of session live period...Can anybody please help?</p>