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IN24/7 Shift Schedule Models: The Families Compared
A 24/7 shift schedule staffs an operation around the clock, every day. Almost every workable design is built from one of three families: four crews on 12-hour shifts, three-to-four crews on 8-hour shifts, or week-block rotations — the rest is tuning.
Why it matters
Continuous cover has hard arithmetic: 168 hours a week, divided among however many crews you can afford. Four crews mean each averages 42 hours — which is exactly why the classic 12-hour patterns (DuPont, Pitman, Panama, 4 on 4 off) all land on 42 hours. Three 8-hour crews land on 56 — too many — so 8-hour models either add a fourth crew (continental, Southern Swing) or accept overtime by design.
Choosing between the families comes down to four trade-offs: shift length (12-hour fatigue vs 8-hour commute count), rotation (fixed crews vs shared nights), break shape (long blocks like DuPont's 7-off vs frequent short breaks), and weekend distribution (2-2-3 cadences guarantee alternating weekends; X-on-X-off patterns share them evenly but unpredictably).
A worked example
| Model | Shape — best for |
|---|---|
| Pitman / Panama (12 h, 4 crews) | 2-2-3 cadence, alternating weekends off — teams that prize predictable weekends |
| DuPont (12 h, 4 crews) | Mixed blocks + 7 straight days off monthly — teams that prize long breaks |
| 4 on 4 off (12 h, 4 crews) | Simplest possible rhythm, 4-day breaks — operations that value simplicity |
| Continental (8 h, 4 crews) | Fast forward rotation, max 2 nights — physically demanding work |
| Southern Swing (8 h, 4 crews) | Week-per-shift rotation — traditional three-shift plants |
| 7 on 7 off (12 h, 4 crews) | Whole weeks on/off — specialist and remote roles |
✓ Do
- Start from minimum staffing per shift, multiply by four crews, then add 10-15% relief for leave and sickness
- Let the team vote between two or three shortlisted patterns — adoption beats optimisation
- Decide fixed-vs-rotating nights explicitly and revisit annually
- Model the overtime profile before launch: every 24/7 pattern has a built-in shape
- Pilot for a full cycle (4-8 weeks) before committing
✗ Don't
- Invent a bespoke pattern before exhausting the proven families
- Run three crews on what needs four — chronic overtime corrodes everything
- Mix pattern families across one team (payroll and fairness both break)
- Ignore handover quality — it's where 24/7 operations actually fail
- Change patterns more than once a year; rosters need stability to be lived in
Variations & alternatives
Build this schedule in Tommy
Set the rotation once and Tommy fills the weeks ahead — shift swaps, leave and coverage gaps handled in one place, with your team always seeing the latest version.
