In reply to The Lemming:
Actually it probably took less than a couple of days.
I remember my father telling me that when he was a boy just after the First war, when he went to Tynecastle and Hearts were playing a team from a mining community the miners used to bring pigeons with them so that they could send the score back home as it happened...
You'll also have heard of the Fiery Cross where simple signals could be sent over areas of many miles very quickly almost instantaneously.
But yes I see your point.
I'd also wonder though about the permanency of a lot of this information. Cave men may not have written very much, but there's not a lot that beats carving information into rocks if you want your message to last.