ten o'clock
` No , I do n't think so . ' The reply was so abrupt , so nearly impatient , that Mrs. Grail made an end of her remarks . In a little while she too began to read . They had supper at nine ; at ten o'clock Mrs. Grail kissed her son 's forehead and bade him good-night , adding , ` Do n't sit long , my dear . ' Every night she took leave of him with the same words , and they were not needless . Gilbert too often forgot the progress of time , and spent in study the hours which were demanded for sleep . His daily employment was at a large candle and soap factory .