public Builder clearTotalBilledTime() {
      bitField0_ = (bitField0_ & ~0x00000002);
      totalBilledTime_ = null;
      if (totalBilledTimeBuilder_ != null) {
        totalBilledTimeBuilder_.dispose();
        totalBilledTimeBuilder_ = null;
      }
      onChanged();
      return this;
    }
<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-v1/src/main/java/com/google/cloud/speech/v1/RecognizeResponse.java