| Value | Category | Cases | |
|---|---|---|---|
| 4-5 hours | 11 |
0.4%
|
|
| 5-6 hours | 84 |
2.8%
|
|
| 6-7 hours | 301 |
10%
|
|
| 7-8 hours | 822 |
27.3%
|
|
| 8-9 hours | 1072 |
35.5%
|
|
| less than 4 hours | 1 |
0%
|
|
| over 9 hours | 725 |
24%
|