Question: how long did we stay on the moon
[{'answer': '21.5 hours'}, {'provenance': [{'wikipedia_id': '662', 'title': 'Apollo 11', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 716, 'bleu_score': 0.5979772917996401, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11846344058497075253}, 'section': 'Section::::Abstract.'}]}]