| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than an hour | 147 |
22.3%
|
| 2 | 1-2 hours | 278 |
42.2%
|
| 3 | 2-4 hours | 172 |
26.1%
|
| 4 | More than 4 hours | 61 |
9.3%
|
| Sysmiss | 225 |