| Duration in Groups | Frequency | Percent % |
| 1 - 20 days | 8 | 14.8% |
| 21 - 40 days | 18 | 33.3% |
| 41 - 60 days | 15 | 27.8% |
| 61 - 80 days | 1 | 1.9% |
| More than 80 days | 12 | 22.2% |
| Total | 54 | 100.0% |