[AlexanderHowl]

Six months relates to the largest empires, like early 14th century Mongolian Empire, early 17th century Spain, or early 19th century Britain. It took around six months for communication to go from Britain to Australia (making an exchange of communication a year long process). Anyway, since the skip warp can be boosted to 500c for a few weeks, you could use special relays to cut an exchange of communications to 13 weeks ago.