Let's talk about Hunts - a detailed rundown of their assumed mechanics

[Steve_UK]

They are definitely not chance to spawn.

It's not? Our croque window open for 3 hours, and no spawn yet...

[Yarukiba]

I've spent less time "trying" and more time into paying attention and I think the random window Vandes talks about in the 1st post is right. If there was just a chance that an action might spawn an S rank that would mean runing around on each location for Brontes would be useless, for exemple. You would just have to step on the landmine, eat, then get out, and come back again. Some people on my server believed it was like this for him so they stayed at the same point but nothing happened, until I tried the others, and he finally showed up after 1 food. On Moogle we killed Croque after his window opened 8 hours ago. He has a window that can extend from 63 hours to 75 hours, which means, if the game randomly choose 72 hours 35 minutes and 21 seconds, if you try to spawn him every hour when his window opens, nothing will spawn until you reach 9 hours 35 minutes and 21 seconds.
I think that's it ? I don't know if I'm easy to understand or if I understood what Vandes means right...

[Vandesaan]

It's not? Our croque window open for 3 hours, and no spawn yet...

please have a re-read of the changed intro post of this thread