Umbran said:
Assuming the DC for creating an arrow is 10, and assuming a 1st level character with a total skill mod of +4 in Craft (bowmaking), and assuming the character has materials on hand, doing progress by the day, you can assemble something on the order of 30 arrows a day, on average. Call it a 10-hour working day, that's about 3 arrows an hour, if that hour is uninterrupted, and you can just sit and work on that and nothing else (like sleeping, or keeping watch).
*snip*
This is just if you are interested:
I just watched Mail Call on the History channel. They had an American Indian create a single arrow by hand. It takes on average 2 hours to create a single arrow.
Find a branch, strip off the bark, get it straight.
Find the right stone (obsidian or some other volcanic rock that is tough yet will flake when hit just right), carve it to make the arrow head.
Find a bird (hawk, turkey, etc etc) kill it and pluck 3 feathers.
Use some rope like material, this guy used sinew from an elk or some other animal, tie on the feathers and tie on the arrow head.
This guy already had the material he didn't have to find anything, it still took him about 2 hours.
You would need an assembly line of people to cranck out a ton of arrows for war. A group of people just finding one type of material. A group of people that would prepare the shaft, a group that would create the arrow heads, a group that would get feathers and a group that would assemble the arrows.
Probably too much realism for most games.