ten o'clock
`` What is she making , captain ? '' Leigh asked , as he went up to take a last look round . `` About five knots , but the wind is getting up . There was scarcely a breath when I turned in , at ten o'clock . '' `` How far do you call it to the mouth of the river ? '' `` It is about forty miles to the tower of Cordouan . Once past that , we reckon we are at sea . ''