public com.google.protobuf.DurationOrBuilder getSpeechStartTimeoutOrBuilder() {
        if (speechStartTimeoutBuilder_ != null) {
          return speechStartTimeoutBuilder_.getMessageOrBuilder();
        } else {
          return speechStartTimeout_ == null
              ? com.google.protobuf.Duration.getDefaultInstance()
              : speechStartTimeout_;
        }
      }
<pre>
Duration to timeout the stream if no speech begins.
</pre>

<code>.google.protobuf.Duration speech_start_timeout = 1;</code>
java-speech/proto-google-cloud-speech-v1p1beta1/src/main/java/com/google/cloud/speech/v1p1beta1/StreamingRecognitionConfig.java