Question: how long did it take workers to build the empire state building
[{'answer': '410 days', 'provenance': [{'wikipedia_id': '9736', 'title': 'Empire State Building', 'start_paragraph_id': 28, 'start_character': 941, 'end_paragraph_id': 28, 'end_character': 949, 'bleu_score': 1.0, 'section': 'Section::::History.:Construction.\n'}]}]