这个案件持续了多久了？
怀柔法院近日开庭审理此案。[{'character': '怀', 'pinyin': 'huai2', 'highest pitch': 10.74, 'lowest pitch': 8.93, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '柔', 'pinyin': 'rou2', 'highest pitch': 11.26, 'lowest pitch': 10.57, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '法', 'pinyin': 'fa3', 'highest pitch': 11.05, 'lowest pitch': 6.28, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '院', 'pinyin': 'van4', 'highest pitch': 8.41, 'lowest pitch': 6.41, 'duration': 0.29, 'prosody hierarchy': '#2'}, {'character': '近', 'pinyin': 'jin4', 'highest pitch': 8.99, 'lowest pitch': 7.69, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '日', 'pinyin': 'riii4', 'highest pitch': 7.69, 'lowest pitch': 7.03, 'duration': 0.19, 'prosody hierarchy': '#2'}, {'character': '开', 'pinyin': 'kai1', 'highest pitch': 9.71, 'lowest pitch': 9.22, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '庭', 'pinyin': 'ting2', 'highest pitch': 9.29, 'lowest pitch': 8.31, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '审', 'pinyin': 'shen2', 'highest pitch': 9.06, 'lowest pitch': 7.84, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '理', 'pinyin': 'li2', 'highest pitch': 9.57, 'lowest pitch': 8.58, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '此', 'pinyin': 'cii3', 'highest pitch': 9.43, 'lowest pitch': 4.14, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '案', 'pinyin': 'an4', 'highest pitch': 7.22, 'lowest pitch': 4.14, 'duration': 0.34, 'prosody hierarchy': '#4'}]