Question: how long did it take picasso to paint guernica
[{'answer': '35 days', 'provenance': [{'wikipedia_id': '1055072', 'title': 'Guernica (Picasso)', 'start_paragraph_id': 21, 'start_character': 35, 'end_paragraph_id': 21, 'end_character': 42, 'bleu_score': 1.0, 'section': 'Section::::Creation.\n'}]}]