Prosperous/other economic buff duration

[Icedkocha]

Has anyone figured out how long a port's economic buff lasts? Can't tell if it's connected to the in-game calendar or not.

[whosyourdaddy]

Basically you just need to check the map every new month, cause they will reset at that time, including shop goods. Idk how long they can last tho, sometimes they just last 3 month, sometimes i feel like they last very very long, but it doesnt matter. Personally when im focus making money, i just check the map every first day of every month and plan the best route to make money, best if you have depressed city near the prosperous one

[Cylvanis]

buff lasts 1- 3 game calendar months, depends on how big the port is