For Crystal at least, roulettes tend to pop fairly quickly. But lately, good luck if you’re trying to queue for something specific outside of peak hours. One of my Mog challenges (the one that isn’t the same for everyone) was a Hard mode dungeon that took 22 minutes to pop, and you can’t just unsync those if you want the Moogle tomes. Also notice some MSQ trials take quite a bit lately. Luckily I have 7.4 glam dresser prep to occupy me for the long dps queues!