| Value | Category | Cases | |
|---|---|---|---|
| 1 | hours | 232 |
29.6%
|
| 2 | days | 128 |
16.3%
|
| 3 | months | 422 |
53.8%
|
| 4 | years | 3 |
0.4%
|
| Sysmiss | 591 |