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TheDistanceMatters

Delivery and escort quests further away have more time to be completed.

These quests will never be shorter than 5 days and on top of that the time it'd take to fast travel there is added with a multiplier (without considering any bonuses).
You can configure the multiplier to apply to the fast travel time, by default it's 2.

In the base game these quests can be anywhere from 1.5 to 14 days regardless of distance.

Settings can be adjusted in the config file that appears on Elin\BepInEx\config after the first launch of the game with the mod enabled or by using https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3379819704 (allows changing the settings without restarting the game).