Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Athlete | Event | Swim (1.5km) | Trans 1 | Bike (40km) | Trans 2 | Run (10km) | Total Time | Rank |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Reto Hug | Men's | 18:55 | 0:27 | 58:20 | 0:29 | 33:53 | 1:52:04.93 | 29.0 |
| Olivier Marceau | Men's | 18:55 | 0:29 | 58:18 | 0:31 | 32:37 | 1:50:50.07 | 19.0 |
| Sven Riederer | Men's | 18:14 | 0:34 | 58:52 | 0:28 | 33:11 | 1:51:19.45 | 23.0 |
| Magali Chopard Di Marco | Women's | 19:50 | 0:30 | 1:04:22 | 0:29 | 36:39 | 2:01:50.74 | 13.0 |
| Daniela Ryf | Women's | 19:56 | 0:26 | 1:04:17 | 0:30 | 35:31 | 2:00:40.20 | 7.0 |
Question:
What was the duration of Daniela Ryf's swimming stage?
Answer:
19:56