You can use the VoiceXML <record> element to capture spoken input; the recording ends either when the user presses any DTMF key, or when the time you specified in the maxtime attribute is reached.
The maxtime attribute defaults to 60 seconds, but is overridden by the Blueworx Voice Response Record Voice Maximum system parameter. You must set this parameter from Blueworx Voice Response to be greater than or equal to (in seconds) the largest maxtime attribute used in your VXML application. Refer to “Controlling messages” in the Blueworx Voice Response: Blueworx Voice Response for AIX: Designing and Managing State Table Applications information.