How can I increase the time out period on the Web Management Site?
To increase the length of time before the Web Management Site will time out a login session, carefully following these instructions:
1.     Navigate to the PrintUsage installation directory and open the folder marked “Avalon”
2.     Using a text editor application, open the file “Web.Config”
3.     On line 78, BEFORE the section “<httpHeaders>” paste the following string:
        <sessionState mode="InProc" cookieless="false" timeout="43200"/>
4.     Replace 43200 with the length of time you want a session to expire after (minutes)