You can set the following recognition timeout parameters in the defaults.xml file as needed:
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.