| Value | Category | Cases | |
|---|---|---|---|
| 4-5 hours | 22 |
0.7%
|
|
| 5-6 hours | 96 |
3.2%
|
|
| 6-7 hours | 297 |
10%
|
|
| 7-8 hours | 667 |
22.5%
|
|
| 8-9 hours | 815 |
27.5%
|
|
| less than 4 hours | 6 |
0.2%
|
|
| over 9 hours | 1063 |
35.8%
|