Eric Clingenpeel wrote:
One think I'd like to point out, (and maybe it was because you were just giving an example?) And Int of 18 would allow for 5 doses to be made at one time, not 4... It adds doses equal to your int bonus to the crafting, not just sets it to your int bonus. But I digress.
A couple of questions:
Is the character in question an alchemist? Swift alchemy makes a big difference in time too. I wondered because...
Your figures are off by a bit, so I was curious how you got them.
28 (ave check) * 14 (dc of poison) = 392 sp
150/39.2 = 3.82 (weeks) (Swift alchemy would make this 1.91 weeks)
Now, if an alchemist with swift alchemy he'd then be able to make 5 doses in 6.25 hours (Of course, if he were an alchemist he couldn't have an 18 skill with an 18 int he'd have to have a 19 with the master alchemist feat... But again, I digress.)
Now, you mentioned that your house rule doesn't come into affect, but it does. By increasing the poison's DC, that will also increase the DC to craft it, and by doing that, you decrease the time it takes to make it. The higher the DC (assuming you can make the check) the more progress you make. Example:
poison DC 14 Skill 18
check = 14 * 28 = 392
Poison DC 15 Skill 18
check = 15 * 28 = 420
Poison DC 20 Skill 18
check = 20 * 28 = 560
So by increasing the DC you would be allowing them to make the poisons even faster because they're getting more work done. (That's why you can voluntarily add +10 to the craft dc to reduce the craft time)
I just wanted to note, that you actually would only be able to create 4 poisons with an INT of 18, because the Master Alchemist feat states that you can create a number of doses equal to your intelligence modifier (minimum 1) at one time. It does not state that you add your INT modifier to number of doses created.