I have a few questions about mundane crafting.
Lets assume the following 0 Int modifier, Craft is a class skill, one rank, improvised tools.
To me that means 0 + 3 + 1 + (-2) = 2 modifier on Craft attempts.
Now if we take 10 on the Craft (Bows) attempt and I am simply making a set of 20 arrows which is 1 gp.
That means I get a 12 on my roll, the arrows DC is 12 so I multiply my roll by the DC which is 144 and divide by 7 which is 20 and change.
This means I can make 2 gp of arrows or 40 a day right? Now how long do these craft checks take? All day (8 hours, 12 hours, 4 hours)?
A 'day' is pathfinder is considered to be 8 hours of labor, but also the total amount of time that can be used to produce something in a 24 hour period.
How this interacts with trying to work longer hours, magic that lets you go without sleep and similar things is not really spelled out and subject to GM interpretation.
The closes to a rule on this that I know of is that you can craft magic items for 4 hours in addition to an adventuring day, but that gets him only 2 hours of progress (so 1/4 of a day) for that 4 hours of work.