And for the village improvement build times, that's in menus.txt. Look for menu_center_improve. Heres an excerpt:
menu_center_improve 0 {s19}_As_the_party_member_with_the_highest_engineer_skill_({reg2}),_{reg3?you_reckon:{s3}_reckons}_that_building_the_{s4}_will_cost_you_{reg5}_denars_and_will_take_{reg6}_days. none 22 1 2 936748722493063459 144115188075856091 2133 2 1224979098644774912 72057594037927936 2320 2 4 0 2320 2 19 1 1 2 936748722493063457 1369094286720630792 2133 2 1224979098644774913 72057594037927936 2133 2 1224979098644774914 72057594037927937 2133 2 72057594037927938 1224979098644774913 2121 3 1224979098644774915 20 1224979098644774913 2107 2 1224979098644774912 1224979098644774915 2108 2 1224979098644774912 20 2123 3 1224979098644774916 1224979098644774912 100 2105 2 1224979098644774916 3 2133 2 72057594037927941 1224979098644774912 2133 2 72057594037927942 1224979098644774916 4 0 31 2 1224979098644774914 360287970189639680 2133 2 72057594037927939 1 5 0 2133 2 72057594037927939 0 2322 2 3 1224979098644774914 3 0 3
The
100 is the amount it divides the cost of the improvement to get the time - so for every 100 denars of cost, it's a day. You could up this to 500 or 1000 to significantly decrease build times. The
3 after that is the amount of days added after it has got the number from dividing - you could set this to 0 to directly knock 3 days off all the build times. While I'm here I might as well note that the
20's are the way engineering skill counts into things. It takes the first 20 minus engineering skill divided by the second 20. So the default is 10 engineering = 50% of the cost and time. You could change them both to 15 to make it 10 engineering give only 1/3 of the cost and time, or even 12 for 1/6 - just don't change it to 10 or less, or it'll be free improvements (which doesn't make much sense!).
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So, looking at this file now, makes no sense. Or maybe it's just because of me using Perisno. Think I should maybe ask them to decode this jumble? Lol.