public boolean hasInterval() {
      return ((bitField0_ & 0x00000040) != 0);
    }
<pre>
Create sprites at regular intervals. Valid range is [1 second, 1 hour] and
the default value is `10s`.
</pre>

<code>.google.protobuf.Duration interval = 7;</code>

@return Whether the interval field is set.
java-video-live-stream/proto-google-cloud-live-stream-v1/src/main/java/com/google/cloud/video/livestream/v1/SpriteSheet.java