eight o'clock in the morning
He paused , then went on musingly : `` The girl used to signal , sometimes , from one of the tower windows . One wave of the handkerchief meant , ` I 'm coming , over ' ; two waves , with a little pause between , meant , ` You are to come over here . ' So the boy used to wait always , after that first wave to see if another followed ; so that he might know whether he were to be host or guest that day . The waves always came at eight o'clock in the morning , and very eagerly the boy used to watch for them all through the summer when the girl was there . '' `` Did they always come , every morning ? '' Asked Jill . `` No ; sometimes the girl had other things to do .