public boolean hasDuration() {
      return ((bitField0_ & 0x00000001) != 0);
    }
<pre>
The total duration in seconds of the content including the ads stitched
in.
</pre>

<code>.google.protobuf.Duration duration = 1;</code>

@return Whether the duration field is set.
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/VodSessionContent.java