FTL Comms

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One of the big differences would be the response time to an invasion of a
system.

Take a system that is 4 jumps from the nearest military base. Without FTL
communication: 1) It would take a minimum of 1 day to get to the military base
(using the minimum 6 hours between jumps). This would about kill the crew with
jump-stress.
2) If there were a courier ring, it would be quicker, but would still take
hours. 3) The military base would have to send out couriers to the various
ships of the fleet on patrol with a message to gather at point X. 4) The ships
would then have to get to X and then go to the invaded system.

With FLT, the military base would be notified almost immediatly and then the
various ships of the fleet almost as fast. The difference could be days or
weeks depending on how far away the military base and ships of the fleet are.

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No, I don't think that there is a narrative that demonstrates this.