It's a daily quest, you can do it everyday.

I'm aware of that. I don't have the time to quest before work.

If you're talking about killing the headless horseman himself, you start the quest right where you fight him, and you can easily 2-3 man him as long as you have something that can tank and something that can heal. Me and Nikki killed him 3 times last night in 30 minutes.