public Builder mergeDuration(com.google.protobuf.Duration value) {
      if (durationBuilder_ == null) {
        if (((bitField0_ & 0x00000010) != 0)
            && duration_ != null
            && duration_ != com.google.protobuf.Duration.getDefaultInstance()) {
          getDurationBuilder().mergeFrom(value);
        } else {
          duration_ = value;
        }
      } else {
        durationBuilder_.mergeFrom(value);
      }
      if (duration_ != null) {
        bitField0_ |= 0x00000010;
        onChanged();
      }
      return this;
    }
<pre>
Total time elapsed for the response.
</pre>

<code>.google.protobuf.Duration duration = 5;</code>
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/ResponseMetadata.java