‘The letter was dispatched by that day's post. In the remote position
of Porthgenna, and in the unfinished state of the railroad at that
time, two days would elapse before an answer from London could be
reasonably hoped for.’
That is from ‘The Dead Secret’, a novel by Wilkie Collins published 150 years ago. The fictional village of Porthgenna is supposed to be near Truro in Cornwall. I wonder how long the exchange might take now, with high speed trains and Royal Mail?