Dark happens a lot in certain zones (pso xja comes to mind, the mire and northlands region get it a good bit too--farm dark crystals in glacier all the time). I agree with blowfin--patience is a virtue after all. Each season runs for roughly 3 1/2 days (1 RLday is almost 25 days). I had to wait a week for fire to start showing up again for one of my GK trials, got it, killed my 10 monkeys in Ifrit's in one cycle... and moved on to finish the trial over the next couple days.