If you were to craft potions of crafter's fortune, could you stack the effect by drinking multiple potions to get a +10 or +15 or your next Craft check?
The description of crafter's fortune states that the duration is 1 day per level or until discharged; it doesn't specifically state that they can't be stacked. I personally feel that this would be possible because it takes 1 round to drink a potion, so it would be 18 seconds to drink 3 potions and then you craft your item.
For background, I am a mutated monkey into a vanaran with a high Intelligence and a custom feat to increase the number of potions I brew at one time by my Intelligence modifier. I also have plans for economic domination using my potions.