web.xml parameter doesn't extend session, WHY?

[Keith Kwiatek]

I am running http and https. My web.xml <session-timeout> parameter doesn't
seem to extend session, It keeps timing out in just 5 or ten minutes.....
WHY? ANY ideas?

THis is what is in my web.xml file.....
<session-config>
  <session-timeout>60</session-timeout>
</session-config>