ten o'clock
`` Thank you ; but you are taking unnecessary trouble , '' she answered gayly , `` since it is only across the street , and there are four of us to keep each other company . '' `` The Misses King are going with you ? '' `` Yes ; they are not quite ready yet ; but it is surely too early to think of going ? '' `` A little ; but Mrs. Schilling is anxious to see you as soon as possible ; particularly as she understands there is no hope of keeping you after ten o'clock . Do you really always observe such early hours ? '' `` As a rule , yes . I believe the medical authorities agree that it is the way to retain one 's youth and health . ''