Basically what you're going to have to consider is how many you LE's you can let spawn within an acceptable timeframe (Yes the DQ's potentially last 24 hours, but there's no way you can expect someone to spend hours doing a daily quest) VS how many people might actually get the DQ + how many kills the DQ requires.
Honestly I think it'd be easier to just get hoof to add a condition to this quest so it can only run if a LE event is active. Save you a lot of trouble.