Question: how long was dark side of the moon number 1
[{'answer': 'a week', 'provenance': [{'wikipedia_id': '42634', 'title': 'The Dark Side of the Moon', 'start_paragraph_id': 38, 'start_character': 210, 'end_paragraph_id': 38, 'end_character': 216, 'bleu_score': 1.0, 'section': 'Section::::Release.:Sales.\n'}]}, {'answer': '42 : 49'}, {'provenance': [{'wikipedia_id': '42634', 'title': 'The Dark Side of the Moon', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4635314322943092961}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '42634', 'title': 'The Dark Side of the Moon', 'section': 'Section::::Release.:Sales.\n', 'start_paragraph_id': 38, 'end_paragraph_id': 38, 'meta': {'evidence_span': ['a week', '"The Dark Side of the Moon" became one of the best-selling albums of all time and is in the top\xa025 of a list of best-selling albums in the United States. Although it held the number one spot in the US for only a week, it remained in the "Billboard" album chart for 741\xa0weeks from 1973 to 1988. The album re-appeared on the "Billboard" charts with the introduction of the Top Pop Catalog Albums chart in May 1991, and has been a perennial feature since then. In the UK, it is the seventh-best-selling album of all time and the highest selling album never to reach number one.', 'Although it held the number one spot in the US for only a week, it remained in the "Billboard" album chart for 741\xa0weeks from 1973 to 1988.']}}]}]