Its always necesary to use throttling in watcher alerts?

Hi, Im using this schedule in my watcher alert

  "trigger" : {
    "schedule" : {
      "daily" : { "at" : "17:00" }
    }
  }

so I was wandering if it is necesary to use throttling in the watchers.

If it's not a really long query I don't see a reason to use it when you run it only once a day.