| The time of the interviews | Number of teachers | Number of interviews | Total (min) | Shortest - longest (min) | Mean (min) |
| Before and after | 8 | 14 | 590 | 30 - 60 | 42 |
| Before | 7 | 7 | 284 | 33 - 46 | 41 |
| After | 7 | 7 | 306 | 30 - 60 | 44 |