Guild items are restocked when the guild opens for the day. A certain number are restocked each day until a maximum is reached. These numbers vary per item -- some items will restock quicker than others, and be available in differing quantities.
Popular items may sell out rather quickly, so you may want to try to be at the guild when it opens.
Note that the price of items will vary depending on the number in stock.
Also note that some items are *not* restocked automatically, and will only be present if a player sells that item to the guild.
SMN 90 | BLM 90 | WHM 83 twitter.com/nupinu
It rubs the fewell on its skin or else it gets the thwack again.
SMN is just epic in it's scope. You gain fame in all cities to have their avatars. When others finish ToAU, they get toys; you get gods.