You can set the following recognition timeout parameters in the defaults.xml file as needed:
If you are using a ScanSoft OSR engine, the completetimeout parameter is ignored, and the value of the incompletetimeout parameter is set to the value of either the completetimeout parameter or the incompletetimeout parameter, according to which value is greater.
To set a parameter, use an editor such as vi to edit the defaults.xml file. Create an entry with the parameter (as a property name) and the value for the parameter. For example, the following entry in the file sets the value of the timeout parameter to 10 seconds:
<property name='timeout' value='10s'/>
The value for each timeout parameter should be specified in seconds. For more information about these timeout parameters, refer to the VoiceXML Specification.