Within the Voicemail Pro Client, click on or select Administration | Preferences | General.
For recordings being placed into a Voicemail Pro mailbox, the Max. Message Length (secs) sets the maximum recording time, up to a maximum of 3600 seconds (1 hour). Note that this affects the messages as well as recordings.
The Max. VRL Record Length (secs) setting is only used for calls being recorded to VRL. The maximum record length is 3600 seconds (60 minutes).