code: protected function queueNextRun()
      {
          $nextRun = new ContentReviewNotificationJob();
  
          $nextRunTime = mktime(
              Config::inst()->get(__CLASS__, 'next_run_hour'),
              Config::inst()->get(__CLASS__, 'next_run_minute'),
              0,
              date("m"),
              date("d") + Config::inst()->get(__CLASS__, 'next_run_in_days'),
              date("Y")
          );
  
          singleton(QueuedJobService::class)->queueJob(
              $nextRun,
              date("Y-m-d H:i:s", $nextRunTime)
          );
      }
docs: Queue up the next job to run.