Tankers do spend time in port
The ones which I sailed on didnt seem to, or maybe it was because the tanker berths were a long way from anywhere, Mina- al - Amadhi, Little Aden, then there was Banias, Sidon, And Tripoli in the Eastern Med.loading offshore, we were like a bunch of well fed monks, on Esso at least. Nope, much preferred a nice big dry cargoship with time in port, a forest of derricks on the decks, and a social life ashore wherever we we were. And of course no beer rationing on board.