i like the idea of both competing and cooperating... but not always knowing which
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so say ~7 days for a message from server to player. even if player responds immediately that's another ~7 days back.
in this scenario the server is waiting for a response before sending the next message, presumably because the player action will affect the next message.
for messages that aren't affected by player action sure, you could send them out a faster rate.
given the speed of international mail 2 weeks between turns seems optimistic.
that's not a problem tho, depends how you script it. some mail could be 'automated reports' which get sent regardless of player response, or there could be a batch of mail sent in short succession.
of course the international postal system has the power to change the order of everything anyway :-)