Sentence:  `` We 'd give him things to deliver , letters , checks , deeds and things like that '' , remembers his half-brother Walter , still in the real estate business in savannah , `` and learn <WSD>days</WSD> later that he 'd absent-mindedly stuffed them into his pocket . 
Meaning of the word marked with <WSD> tags:  time for Earth to make a complete rotation on its axis