Coláiste Mhuire Co-Ed operates a 9 period day on Monday and Tuesday and an 8 period day on Wednesday, Thursday and Friday.
Students are encoraged to be at school by 8.45am as morning registration takes place at 8.55am.
The following is a breakdown of the school day
Registration (8.55-9.00) roll call
| Monday | Tuesday | Wednesday | Thursday | Friday | |
| Start Time | 09:00 | 09:00 | 09:00 | 09:00 | 09:00 |
| Morning Break | 11:00 – 11:15 | 11:00 – 11:15 | 11:00 – 11:15 | 11:00 – 11:15 | 11:00 – 11:15 |
| Lunch | 13:15 – 14:00 | 13:15 – 14:00 | 13:15 – 14:00 | 13:15 – 14:00 | 13:15 – 14:00 |
| Finish Time | 16:00 | 16:00 | 15:20 | 15:20 | 15:20 |
After school study is also available for 2 hours every evening.
