Thinking twice, the time for notices to travel should be far less, because the usual way of communication between Baldurs Gate and Athkatla shouldnt be via land, but via sea. A sailing ship can do those 400 miles in around 5 days. I took into account the fact that sailign ships cant travel in a straight line. Sea is far quicker (and sometimes safer) than any land route in an old technology enviroment.
Athkatla is a trading city, same as Baldurs Gate, so, I would guess at least one ship is bound for Athkatla (or returns to Athkatla) every week.
Except for the entirety of BG1 you see foot messengers traveling between BG and Amn with news about the brewing war. If communication by ship was as developed as you suggest, there's no reason for those messengers.
Well, it is clear that the messengers are part of the narrative. They are a way of telling you about events, not real messengers. Important news would travel via sea or via land, BUT using horses. Really important ones should be told by teleporting or magical means.
Oh, well then if you're willing to imagine how things work outside the game to have things make sense then there's no plot hole at all!
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I approve!