The micro ones take under an hour, simple because there's not much room to get crazy. The small and mediums are usually between 1.5 and 3 hours, depending on what I'm doing, and whether I'm trying something new. The ones with "water" sometimes need to sit out and set overnight, depending on whether I'm using gel or resin. I do need to get a Rarity in there (and an AJ, of course), but I'm sadly hindered by the local selection of blind bags. My best source (KMart) sold out their box and hasn't replaced it yet