e.g. number of days to take a message across the atlantic in the 17th, 18th, 19th and 20th century.
Many thanks in advance for any help and support.
hi! hopefully someone can help you out with a more comprehensive response, but FYI, you'll find a few scraps to get you started on the speed of comms in the past in this section of the FAQ*
*see the link on the sidebar or the wiki tab