| Value | Category | Cases | |
|---|---|---|---|
| 0 | None | 49 |
4.9%
|
| 1 | 1 hour | 214 |
21.4%
|
| 2 | 2 hours | 272 |
27.2%
|
| 3 | 3 hours | 158 |
15.8%
|
| 4 | 4 hours | 94 |
9.4%
|
| 5 | 5 hours | 50 |
5%
|
| 6 | 6 hours | 18 |
1.8%
|
| 7 | 7 hours | 20 |
2%
|
| 8 | 6 |
0.6%
|
|
| 10 | 5 |
0.5%
|
|
| 15 | 1 |
0.1%
|
|
| 16 | 1 |
0.1%
|
|
| 97 | Less than 1 hour | 112 |
11.2%
|