Use the Maximum Message Length field on the System Mailboxes Web page to define the number of minutes or megabytes of the longest message that a user can create on the Messaging system. The default value is 100 minutes. This is a system-wide setting that applies to all users. However, if you want to set additional restrictions for your users, you can do so using the Class of Service Web page.
Use the Maximum voice message length field on the System Parameters Web page to define the maximum time for a message recording in seconds. The default value is 1200 seconds, that is, 20 minutes. The maximum value you can enter in this field is 4500 seconds, that is, 75 minutes. The value you specify in the Maximum call answer message length field on the Class of Service Web page must not exceed the value you specify in the System Parameters Web page.