The Halloween festival can be repeated once a RL day. When the day "Switches over" (To 0:00GMT) that is when your time resets. It's not a timer on you, it is not a 24 hour reset. If you do the quests at 23:50GMT it will reset in 10 minutes.

Penned by my hand on the 16th of Artificium, in the year 89 AM.