private com.google.protobuf.SingleFieldBuilderV3<
              com.google.protobuf.Duration,
              com.google.protobuf.Duration.Builder,
              com.google.protobuf.DurationOrBuilder>
          getWritesDoneGracePeriodFieldBuilder() {
        if (writesDoneGracePeriodBuilder_ == null) {
          writesDoneGracePeriodBuilder_ =
              new com.google.protobuf.SingleFieldBuilderV3<
                  com.google.protobuf.Duration,
                  com.google.protobuf.Duration.Builder,
                  com.google.protobuf.DurationOrBuilder>(
                  getWritesDoneGracePeriod(), getParentForChildren(), isClean());
          writesDoneGracePeriod_ = null;
        }
        return writesDoneGracePeriodBuilder_;
      }
<pre>
The grace period after which a `writes_done_request` is issued, that a
`WritesDone` is expected from the client.

The server is free to cancel the RPC should this expire.

A system default will be chosen if unset.
</pre>

<code>.google.protobuf.Duration writes_done_grace_period = 6;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/ReceiveEventsRequest.java