2020/11/16: 21:00 - 23:00 = 2h

2020/11/17: 08:00 - 11:00 , 17:00 - 21:00 = 7h

2020/11/18: 10:00-11:00 , 15:00 -16:00 , 19:00 - 20:00 = 3h

2020/11/20: 16:00 - 18:00 = 2h

2020/11/21: 10:00 - 12:00 , 15:00 - 22:00 = 9h

2020/11/23: 18:00 - 20:00 , 21:00 - 01:00 = 6h