熊猫-重叠的开始和结束时间的持续时间计算

Question

我有以下数据框：

+--------+----------+----------------------------+---------------------+---------------------+----------+
| Device | Category |           Event            |     Start Time      |      End Time       | Duration |
+--------+----------+----------------------------+---------------------+---------------------+----------+
| WTG22  | State    | Windturbine NO COMMUNICATE | 2019-06-26 12:23:46 | 2019-06-26 13:42:54 | 1:19:08  |
| WTG22  | State    | Windturbine PAUSE          | 2019-06-26 12:23:46 | 2019-06-26 13:42:54 | 1:19:08  |
| WTG22  | State    | Windturbine NO COMMUNICATE | 2019-06-26 12:23:47 | 2019-06-26 13:42:54 | 1:19:07  |
| WTG22  | State    | Windturbine EMERGENCY      | 2019-06-26 12:23:47 | 2019-06-26 12:24:09 | 0:00:22  |
| WTG22  | State    | Windturbine EMERGENCY      | 2019-06-26 12:23:47 | 2019-06-26 12:24:11 | 0:00:24  |
| WTG22  | State    | Windturbine NO COMMUNICATE | 2019-06-26 12:24:11 | 2019-06-26 13:42:55 | 1:18:44  |
+--------+----------+----------------------------+---------------------+---------------------+----------+

我需要工期列来说明重叠时间。如果一个事件的结束时间大于该事件之前的每个结束时间，则该事件应只有一个持续时间：

+----------+
| Duration |
+----------+
| 1:19:08  |
| 0:00:00  |
| 0:00:00  |
| 0:00:00  |
| 0:00:00  |
| 0:00:01  |
+----------+