Adventure Seed 2: Felrican Nights
It takes 10-15 minutes for an average reader to digest 2500 words. In that amount of time, you could be up and running a game session. All you need are this Adventure Seed, your game's rulebooks, and whatever monster and NPC stats your game provides. That and a few players and you're off and running.
In the city of Felric's Redoubt, there are many predators, but when a series of vicious wolf attacks plague the night, the characters must race to find the beast before the next full moon.