from the pdf srd I have this on Slayer arrow: greater
Requirements Craft Magic Arms and Armor, finger of death
(slaying arrow) or heightened finger of death (greater
slaying arrow); Cost 1,144 gp 5 sp (slaying arrow) or 2,032
gp (greater slaying arrow)
so either 5 full days or 21 quarter days after determining what is the sub type of his particular target.
i never got the answer to the question that I asked several times when we met the diplomat, or what ever he called himself.
Was he an undead, or outsider?
[sblock=speceial craft notes]
http://paizo.com/pathfinderRPG/prd/skills/craft.html#craft
add +10 to dc to show for faster craft rate
base: DC 15
mighty +4: +8 to DC
total :33
Skill: +30; take ten for 'roll' of 40
comp long bow, mighty +4 base cost: 500 gp; Raw materials: 166.6 gp(1666 SP)
progress of 1 week: roll of 40 * dc 33 = 1320/ wk or 188/full day of work or 47sp of progress per adventuring day
[/sblock]