public Builder setDuration(com.google.protobuf.Duration value) {
      if (durationBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        duration_ = value;
      } else {
        durationBuilder_.setMessage(value);
      }
      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