Four 12-hour shifts on, four days off — the simplest 12-hour pattern for 24/7 coverage.
Schedule PatternThe 4-on/4-off schedule is a 12-hour pattern in which each crew works four shifts and then has four days off, over and over. Four crews cover a 24/7 operation. Because the 8-day rhythm doesn’t match the 7-day week, days off move later each week and line up with the calendar again every eight weeks. Crews average 42 hours a week.
The 4-on/4-off is the simplest 12-hour schedule for continuous operations: work four, off four, repeat. There is nothing to memorize beyond that — which is a large part of its appeal. What makes it different from patterns like the 2-2-3 or the DuPont is that its 8-day cycle slides across the calendar instead of repeating on the same weekdays.
Each crew works four 12-hour shifts, then has four days off. On a calendar, the work block starts one day later each week, so days off rotate through every day of the week. The grid shows one crew over the eight weeks it takes for the pattern to return to the same weekdays.
| Week | Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|---|
| Week 1 | W | W | W | W | – | – | – |
| Week 2 | – | W | W | W | W | – | – |
| Week 3 | – | – | W | W | W | W | – |
| Week 4 | – | – | – | W | W | W | W |
| Week 5 | – | – | – | – | W | W | W |
| Week 6 | W | – | – | – | – | W | W |
| Week 7 | W | W | – | – | – | – | W |
| Week 8 | W | W | W | – | – | – | – |
Four crews cover the clock: two on days and two on nights, each pair offset by four days. Crews can stay on fixed days or fixed nights, or rotate between them.
| At a glance | |
|---|---|
| Shift length | 12 hours |
| Crews needed for 24/7 | 4 |
| Full cycle | 8 days (back on the same weekdays every 8 weeks) |
| Average hours per week | 42 |
| Shifts worked per year | About 182 |
| Weekends off | 3 full weekends of every 8, plus 2 half weekends |
| Most shifts in a row | 4 |
| Longest break | 4 days |
| Days and nights | Fixed or rotating |
The 4-on/4-off tends to fit operations that want a 12-hour schedule people can understand at a glance, with consistent four-day breaks. It is a weaker fit for workforces where fixed weekly routines or weekends matter most, and where four 12-hour shifts in a row would be too demanding for the work.
A pattern is only the starting point. Which one fits depends on your coverage needs, your workforce’s preferences, your overtime and absence rates, and the policies that go with the schedule — and most sites end up with a variation tailored to them. That analysis is what a Shiftwork Solutions engagement does. Talk with us about your operation, or start with the free Shiftwork Assessment.
