Each type of unspoiled node will pop at a specific time of the game day, then vanish 3 game hours later, or after you've used the node in full. Whichever comes first. But yes, there is a pattern. For example Astral Rock will always spawn at 9pm, Darksteel Ore always at 1am, Gold Sand always at 5am, Gold Ore always at 9am, and so on, and so on.
____________________________Final Fantasy XI Character(s) Name:
Carbuncle (RIP Gilgamesh) Jobs:
99DRG, 99PLD, 99RDM, 99WHM | Everything else: 50-60 ~Retired.~ Final Fantasy XIV Character(s) Name:
Satisiun Desain Server(s):
Sargantas (primary) DoW/DoM/DoH/DoL: