Would an Atlantic convoy campaign make the war a long one?

Would an Atlantic convoy battle be part of a short war or a long-war scenario?

It implies a longer war because organizing and moving the convoys alone takes more than two weeks.

Once reinforcement depends on merchant shipping, the war cannot be judged only by the first land battles. Organizing escorts and assembling merchant formations already takes days. Crossing the Atlantic, unloading cargo, returning ships, and replacing losses extend the campaign further. The existence of a convoy battle therefore makes this a war lasting beyond two weeks and turns sealift endurance into part of the strategic outcome.