seven in the evening
`` You are sure of that ? '' `` Perfectly . '' `` And when does the boat leave Shanghai ? '' `` On the 11th , at seven in the evening . We have , therefore , four days before us , that is ninety-six hours ; and in that time , if we had good luck and a south-west wind , and the sea was calm , we could make those eight hundred miles to Shanghai . '' `` And you could go -- '' `` In an hour ; as soon as provisions could be got aboard and the sails put up . '' `` It is a bargain .