public com.google.protobuf.Duration.Builder getTotalBilledTimeBuilder() {
      bitField0_ |= 0x00000002;
      onChanged();
      return getTotalBilledTimeFieldBuilder().getBuilder();
    }
<pre>
When available, billed audio seconds for the corresponding request.
</pre>

<code>.google.protobuf.Duration total_billed_time = 3;</code>
java-speech/proto-google-cloud-speech-v1p1beta1/src/main/java/com/google/cloud/speech/v1p1beta1/RecognizeResponse.java