four o’clock
But aloud I said , `` Thanks ; do n't be too long , or I shall be tempted to smash the door . '' `` You 'll find that impossible , '' answered Carmona . `` Do n't worry if I seem to be gone an age . There 's only one man on duty to-day who knows the secret of this room ; I asked for him when we came , but his comrade said he was away on leave till four o'clock . It must be that now , and I 'll have him here as soon as possible . He will be the more pleased to set you free , as he 's an old friend of yours . You remember little Rafael Calmenare ? ''