When I was on "Golfito" in 1960 & '61, we sailed from Southampton on Tuesday, arriving Bridgetown, Barbados on the morning of the Thursday nine days later. There we would anchor off to discharge and load passengers and mail by lighter and then leave that afternoon for Port of Spain, Trinidad, where we arrived the following morning, Friday.
That afternoon, we sailed for Kingston, Jamaica where we arrived late evening on Sunday, two days later. There we would normally first take bunkers, before berthing to discharge passengers and cargo on Monday morning.
So the outward trip took from the Tuesday morning of one week to the Monday morning almost two weeks later (either 12 or 13 days depending on how particular you are about rounding-up or rounding-down parts of a day).
That schedule was maintained on each of the 7 voyages I did on the vessel, even on a couple of occasions when the starting point was Avonmouth rather than Southampton.