public Builder setSpeechStartTimeout(com.google.protobuf.Duration value) {
        if (speechStartTimeoutBuilder_ == null) {
          if (value == null) {
            throw new NullPointerException();
          }
          speechStartTimeout_ = value;
        } else {
          speechStartTimeoutBuilder_.setMessage(value);
        }
        bitField0_ |= 0x00000001;
        onChanged();
        return this;
      }
<pre>
Duration to timeout the stream if no speech begins. If this is set and
no speech is detected in this duration at the start of the stream, the
server will close the stream.
</pre>

<code>.google.protobuf.Duration speech_start_timeout = 1;</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/StreamingRecognitionFeatures.java