As I've been working on the sample games I've noticed that a flat 15 days for all quests doesn't work. For some Quests it isn't even a challenge, and others are still impossible. What I've done instead is make the time limit equal to the base Waylay rating of the Quest. This required modifying some of the Quests, Like Seek the Oracle's Advice, so that not as much travel is called for, or that additional tasks give you extra time. The exceptions are Balm for Madness, which is double the base Waylay rating due to having to cross the map twice (and is really two quests in one), and Middlemarch Invaders, which has no time limit. Still, it wouldn't hurt for players to choose at least one Merit with a movement option, like the Warhorse I chose in my example.
For KIM, this is a little more problematic due to the high Waylay ratings. I'll have to see how that shakes out when I get to that part of the game.
The modified Quests now list Days for each Quest that represent the time limit, and are in the original The Legend of Arcadia post, found here.