| Work hour(s) | No. | Description | Work schedule | |
| Morning | Afternoon | |||
| 0 | 4 | Not subjected for work (control) | - | - |
| 4 | 4 | Work 4 hours per day | 8:00 to 12:00 | - |
| 6 | 4 | Work 6 hours per day | 8:00 to 12:00 | 14:00 to 16:00 |