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Traders then spent the last half - hour `` watching to see if the Dow would drop 250 points , '' Mr. Dubnow added , referring to the level at which the stock market itself would have closed for an hour .
 time: the last half - hour; cardinal: 250; person: Dubnow; time: an hour
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 time: the last half - hour; cardinal: 250; person: Dubnow; time: an hour