six o'clock
The school law wo n't let me keep you longer than an hour at night , but every night for a month you 'll stay an hour after school . And , Tim , here 's a note for your father . Do n't try to get out of delivering it . I 'll call him up at six o'clock to-night and ask if he has received it . '' Tim gave his father the note that night , and something very serious happened to him . More than that , he had to work every Saturday for a long , long time in his father 's store to help pay the money his father insisted on sending to Miss Mason . Of course it was impossible to replace the book , for the autographs could never be collected again , but Mr. Roon was determined to pay Miss Mason the sum her friend had spent for the book .