Probably 40x3 since 12tpy=3x4tpy
Maybe the world.lua in the 12tpy pack defines it.
But I'm not sure since I've never modded reforms nor seen how they works, and it has been years since my last 12tpy campaign.
May I ask you to report what kind of campaign are you doing (S/M/L/) and how is it going?
Just for curiosity.
EDIT: i was wrong, 12 tpy DeI submod doesn't affect reforms. Thought it was set for.
Tomorrow I'll do some packs to increase turns.