public com.google.protobuf.Duration.Builder getTotalBilledTimeBuilder() {
      bitField0_ |= 0x00000010;
      onChanged();
      return getTotalBilledTimeFieldBuilder().getBuilder();
    }
<pre>
When available, billed audio seconds for the stream.
Set only if this is the last response in the stream.
</pre>

<code>.google.protobuf.Duration total_billed_time = 5;</code>
java-speech/proto-google-cloud-speech-v1/src/main/java/com/google/cloud/speech/v1/StreamingRecognizeResponse.java