@java.lang.Override
  public com.google.cloud.video.stitcher.v1.PrefetchConfig getDefaultInstanceForType() {
    return DEFAULT_INSTANCE;
  }
<pre>
The duration in seconds of the part of the break to be prefetched.
This field is only relevant if prefetch is enabled.
You should set this duration to as long as possible to increase the
benefits of prefetching, but not longer than the shortest ad break
expected. For example, for a live event with 30s and 60s ad breaks, the
initial duration should be set to 30s.
</pre>

<code>.google.protobuf.Duration initial_ad_request_duration = 2;</code>
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/PrefetchConfig.java