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  #6  
Old 4th January 2019, 01:03 AM
tinc tinc is offline
Hatchling
 
Join Date: Jan 2019
Posts: 2
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My fortress isn't finished yet, so I only have experience with the gold pit.
Each upgrade takes 15 days.
The amortization on charlevel 400 is about 250 days after completion of the upgrades.
Btw the upgrade to stage 255 would need almost 9 years.
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