ten o'clock
She said she knew I had a secret from her , and I owned that I had , but she said she would not try to guess , but would wait for the time for me to tell her . And so the summer sped by . Of course I saw my sweetheart , as I then called my mother , less and less . For I worked till it was pitch-dark at the castle ; and after it was closed in , so I could work inside , I often worked till ten o'clock by candlelight . I do not know how I lived with so little sleep ; I am afraid I slept pretty late on Sundays . But the castle grew and grew , and the common-room , which I was most eager to finish wholly before cold weather , was in complete order three full weeks before my mother 's birthday came . Then came the joy of furnishing it .