public Builder setEndOffset(com.google.protobuf.Duration value) {
      if (endOffsetBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        endOffset_ = value;
      } else {
        endOffsetBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00000002;
      onChanged();
      return this;
    }
<pre>
Time offset relative to the beginning of the audio,
and corresponding to the end of the spoken word.
This field is only set if
[enable_word_time_offsets][google.cloud.speech.v2.RecognitionFeatures.enable_word_time_offsets]
is `true` and only in the top hypothesis. This is an experimental feature
and the accuracy of the time offset can vary.
</pre>

<code>.google.protobuf.Duration end_offset = 2;</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/WordInfo.java