Math for crafting magic items faster than normal

[Gliz]

Given the following assumptions:

1) The Cooperative Crafting feat cuts crafting time for a specific category of magic items by 50%.

2) The accelerated crafting rules allow you to cut the time by 50%.

3) The Arcane Builder arcane discovery for wizards will cut it by 25%.

Would the time required to craft such an item be (.50)x(.50)x(.75)=.1875, or 18.75% of the normally required crafting time (rounded up to the next full day, of course)?

Thanks!

[Gliz]

bump

[Tiny Coffee Golem]

I have no idea if they stack, but I'm very curious about the answer.

[VRMH]

Either that, or it takes -25% of the time. In which case you'd be done before you start.
I suggest you go with whatever causes the fewest temporal paradoxes.

[Majuba]

They should stack, as they don't all do the same things:

Cooperative Crafting: You double "the gp value of items that can be crafted each day" by someone else. [Both must have item creation feat]

Accelerated Crafting: Achieves a full-day's crafting in just 4 hours (and then you can craft another 4 hours if you like).

Arcane Builder: You create items 25% faster. [Single item type]

Note, Arcane Builder and Cooperative Crafting don't stack on the same character. Cooperative Crafting helps someone else, Arcane builder helps you.

So if you have Craft Wondrous Item and the Arcane Builder discovery, and your friend has 1 rank in Craft(Basketweaving), Craft Wondrous Item, and Cooperative Crafting, you can:

1. Craft 1250 gp per 8 hours by yourself (normal DC), 625 cost
2. Craft 2500 gp per 8 hours working together (normal DC), 1250 cost
3. Craft 2500 gp per 4 hours working together, or 5000 gp / 8 hours (DC +5), 2500 cost

#3 takes just 20% as long as with just the Craft Wondrous Item feat.

[Not 18.75%, because being 25% faster at something means you take 20% less time (5/4 as fast takes 4/5 as long)].

[Gliz]

[edited for spelling]

Thanks for the input, folks.

For what it's worth, I was mainly concerned with whether there was consensus that they would stack, and whether the time reductions were multiplicative. That's all confirmed, so thanks!

In practice, the more likely route I'd take is to combine 2 of the 3 variables, but it's nice to know that any of them could be combined.

[JTibbs]

Use a Valet Familar archetype to gain the cooperative crafting benefit. You lose Alertness, but i think its worth it in the end.

Just remember to cast Crafters Fortune to get an extra +5 to your check.