about six o'clock
`` Ouskout ! -LRB- be silent -RRB- ! '' the Sudânese yelled in reply ; and they sped on . In Egypt night falls about six o'clock , so the twilight soon became extinct and after a certain time the great moon , ruddy from the reflection of the twilight , rolled on and illuminated the desert with a gentle light . In the silence could be heard only the heavy breathing of the camels , the rapid hoof-beats on the sand , and at times the swish of whips . Nell was so tired that Stas had to hold her on the saddle . Every little while she asked how soon they would reach then destination , and evidently was buoyed up only by the hope of an early meeting with her father .