An example of Drupal's hook_cron_queue_info() in action.

profile_cron_queue_info.php

<?php

function profile_cron_queue_info() {
  $queues = array(
    'import_profiles' => array(
      'worker callback' => 'profile_import_profiles’,
      'time' => 60*30, //Give a max of 30 minutes per import, this is a large job!
    ),
    'active_status_sync' => array(
      'worker callback' => 'profile_active_status_sync',
      'time' => 60*10, //Give 10 minutes for this, it is less time consuming
    ),
  );

  return $queues;
}