To extend the session time, in the admin cp, in vBulletin Options, in User and Registration options, change the Timeout for Cookie setting. The default is 900 seconds, which is 15 minutes.
Alternatively, you could install the Persistent Mark Forums Read hack (do a search using those words), which eliminates the timeout, and once you mark a forum as read, it stays like that, until it's really been posted to again.
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