Mrs. White spent 50 minutes shopping. Mrs. White / 50 minutes Mrs. White spent 50 minutes shopping.
Jane spent two hours watching the movie. Jane / two hours Jane spent two hours watching the movie.
Mr. Li spent one hour taking a bath. Mr. Li / one hour Mr. Li spent one hour taking a bath.
Mark spent all morning decorating the Christmas tree. Mark / all morning Mark spent all morning decorating the Christmas tree.
Sam spent all night studying English. Sam / all night Sam spent all night studying English.
Betty spent three hours listening to English songs. Betty / three hours Betty spent three hours listening to English songs.
Alice spent Saturday afternoon writing a letter. Alice / Saturday afternoon Alice spent Saturday afternoon writing a letter.