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The alchemist archetype eldritch poisoner gets the class feature toxicology, which halves the time it takes to create poisons. I'm assuming this stacks with the alchemist's class feature swift alchemy which also halves the time it takes to create poisons and alchemical items.

A level 3 poisoner has a Craft (alchemy) bonus of +18 and the feat Master Alchemist. How fast can he make a dose of the poison gray justice?

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  • \$\begingroup\$ I've just been asking this, I hope it helps. \$\endgroup\$
    – Zachiel
    Jun 26, 2016 at 12:41
  • \$\begingroup\$ Welcome to the site. Take the tour. The original question said the alchemist's Craft (alchemy) skill check was +18, but the math only seemed to work out to +15 (this is kind of a big deal as my answer below shows). When I edited the question, I stuck with +18 but you might want to check your character sheet. Thank you for participating and have fun. \$\endgroup\$
    – Hey I Can Chan
    Jun 26, 2016 at 12:54
  • \$\begingroup\$ Thank you for your great reply :) just so you know, the number I had worked out was 3 ranks plus 3 class skill, another 3 from class feature plus an additional 2 from toxicologist, plus 5 from 20 int and 2 from skill focus \$\endgroup\$
    – Andy Taylor
    Jun 27, 2016 at 10:51

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Normal speed…

Assuming consistent Craft (alchemy) skill check results of 28, an eldritch poisoner alchemist that possesses a Craft (alchemy) skill bonus of +18 completes 504 sp of progress on a 4,000-sp dose of gray justice each 1/4 day, completing a dose in 8 days. If the GM allows this alchemist to make multiple Craft skill checks in a day, the alchemist can complete the dose of gray justice in but 2 days. (This progress is determined by taking 28 (the check's result) × 18 (the Craft (alchemy) skill check DC of the poison gray justice) = 504 sp.)

…Accelerating…

Were this alchemist confident or if the GM allows this alchemist to take 10 on this Craft (alchemy) skill check, the alchemist can accelerate this crafting time, adding +10 to the DC therefore making the Craft (alchemy) skill check DC 28 for the 4,000-sp dose of gray justice. That alchemist then completes 784 sp of progress on the dose of gray justice each 1/4 day, completing a dose in 6 days. If the GM allows this alchemist to make multiple Craft skill checks in a day, the alchemist can complete the dose in but 1 1/2 days. (This progress is determined by taking 28 (the check's result) × 28 (the accelerated Craft (alchemy) skill check DC of the poison gray justice) = 784 sp.)

…And full throttle with the feat Master Alchemist

The feat Master Alchemist makes this far faster. Such an alchemist can create a dose of gray justice in 1/4 of day even without accelerated crafting, the feat Master Alchemist making the poison's virtual cost (for the purposes of its time to create only) a mere 400 sp.

Notes

  • The Advanced Player's Guide FAQ contains this brief exchange:

    For the purposes of an alchemist's class abilities, are poisons considered alchemical items?
    Yes.

    Thus the alchemist's extraordinary ability swift alchemy applies to poisons.

  • Unlike D&D 3.5 which differentiates between real-word and in-game units, Pathfinder simply never uses real-world multiplying on rolls, and time needed to Craft isn't a roll. The combination of the extraordinary abilities swift alchemy and toxicology reduces the time to 1/4.
  • The GM may mandate a creature can't make more than 1 Craft skill check per day. Try to persuade such a GM to change his mind.
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  • \$\begingroup\$ Master Alchemist takes it one step further than that, even - making intmod doses in that time period, rather than just one. Admittedly, that does go a bit beyond the scope of the question as presented. \$\endgroup\$
    – Ben Barden
    May 25, 2017 at 14:28

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