public Builder mergeSpeechStartTimeout(com.google.protobuf.Duration value) {
        if (speechStartTimeoutBuilder_ == null) {
          if (((bitField0_ & 0x00000001) != 0)
              && speechStartTimeout_ != null
              && speechStartTimeout_ != com.google.protobuf.Duration.getDefaultInstance()) {
            getSpeechStartTimeoutBuilder().mergeFrom(value);
          } else {
            speechStartTimeout_ = value;
          }
        } else {
          speechStartTimeoutBuilder_.mergeFrom(value);
        }
        if (speechStartTimeout_ != null) {
          bitField0_ |= 0x00000001;
          onChanged();
        }
        return this;
      }
<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