Question: how long does it take to film a season of planet earth
[{'answer': 'Five years', 'provenance': [{'wikipedia_id': '4039424', 'title': 'Planet Earth (2006 TV series)', 'start_paragraph_id': 1, 'start_character': 91, 'end_paragraph_id': 1, 'end_character': 101, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4039424', 'title': 'Planet Earth (2006 TV series)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 378, 'bleu_score': 0.9684940092844061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15105348866247754281}, 'section': 'Section::::Abstract.'}]}]