a quarter past eleven
`` That is easily done by the people at the hotel . I did not tell them where I was going . I never even thought of telling them . But they know I was only gone half an hour ; for before going out , or just as I was going out , I ordered the carriage to be ready to take me to the depot at a quarter past eleven . '' `` They may have forgotten all about you . '' `` Not at all . I am an old customer , though a young man .