public com.google.protobuf.Timestamp.Builder getStartTimeBuilder() {
      bitField0_ |= 0x00000002;
      onChanged();
      return getStartTimeFieldBuilder().getBuilder();
    }
<pre>
Time when the request was received.
</pre>

<code>.google.protobuf.Timestamp start_time = 2;</code>
java-speech/proto-google-cloud-speech-v1/src/main/java/com/google/cloud/speech/v1/LongRunningRecognizeMetadata.java