Apps Limit the Time Speech Recognizer Listens for Speech

[The_app_main]

I am developing an app that uses the speech recognizer but I only want the speech recognizer to listen for speech for x number of seconds regardless of when the last speech input was or was not recognized. I looked through the speech recognizer documentation and I didn't see paramater to set the exact time the speech recognizer runs for. Any ideas on how I could accomplish this?

Thanks