Question: how long does an offer last contract law
[{'answer': 'Delivery date', 'provenance': [{'wikipedia_id': '2056222', 'title': 'Offer and acceptance', 'start_paragraph_id': 6, 'start_character': 229, 'end_paragraph_id': 6, 'end_character': 242, 'bleu_score': 1.0, 'section': 'Section::::Offer.\n'}]}, {'provenance': [{'wikipedia_id': '2056222', 'title': 'Offer and acceptance', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 558, 'bleu_score': 0.980097014099621, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 839821307346922609}, 'section': 'Section::::Offer.\n'}]}]