Thread:Project:Support desk/Timeout before having to login again?

How do I set the session timeout before a user has to login again? I'm talking about the amount of time that users remains authenticated if they do not check the "remember my login on this browser" box when they login (and they don't close their browser). This time seems to have gotten significantly shorter since I did a webserver and Mediawiki upgrade, but I don't see any configuration values that control this time.

I'm running:
 * Mediawiki 1.17.0
 * PHP 5.3.2-1ubuntu4.9 (apache2handler)
 * MySQL 5.1.41-3ubuntu12.10
 * AuthWordPress 0.9.0