The value of Session.TimeOut is in minutes. The maximum value is 1440 minutes, which is 24 hours. If you assign it a larger value such as 1441, a runtime error will occur. The error message is similar to the following:
SessionID error 'ASP 0164: 80004005'
Invalid timeout value
/manage_content/Check the entered administrator name and password.asp, line 109
The specified timeout value is invalid.