It states in the crafts skill "one week/day of dedicated work." And whatever you create gets done quicker the higher you roll. However, I am curious to know how you would implement multiple larger projects, or even several smaller ones, all in the same day/week.
For example, could I work on, say 6 vials of acid in one day, even though I do not finish any of them. Could I just track their individual progress?
And could I make a check for a larger object, say a carriage, using the weeks worth calculation, then each day also work on some more vials of acid?