DuPont schedule: how the 12-hour, 4-team rotation works

The DuPont schedule is a rotating shift pattern that keeps a plant, hospital unit or dispatch center staffed 24 hours a day, 7 days a week, with four teams working 12-hour shifts. Each team cycles through day and night blocks over 28 days and then gets seven days off in a row. It is named after the DuPont company, which is widely credited with developing it, although the history is mostly retold by scheduling vendors rather than documented in primary sources. This guide gives you a complete DuPont schedule example for teams A to D, the real hours each week, and the overtime math employers need to budget for.

How the DuPont shift schedule works

Every DuPont shift schedule has the same building blocks:

• Four teams, usually called A, B, C and D. Each team has the same mix of roles, so any team can run the operation on its own.
• Two 12-hour shifts a day, such as 7:00 a.m. to 7:00 p.m. (days) and 7:00 p.m. to 7:00 a.m. (nights). There are only two handoffs every 24 hours.
• A 28-day cycle. Each team follows the same sequence, one week apart from the next team, so on any given day one team is on days, one is on nights and two are off.

One team’s sequence looks like this:

The arithmetic is the reason the pattern works. Fourteen 12-hour shifts are 168 hours. Spread over four weeks, that is 42 hours a week. And because 4 teams × 42 hours = 168 hours, exactly the number of hours in a week, four people can cover one position around the clock with no gaps. Over a year, one position needs 8,760 hours of coverage (365 × 24), or 2,190 hours per person.

DuPont schedule example: the full 28-day grid

Here is the complete rotation for all four teams. Day 1 is a Monday. D is a 7 a.m. to 7 p.m. day shift, N is a 7 p.m. to 7 a.m. night shift and a dash is a day off. Team B runs one week ahead of Team A, Team C two weeks ahead and Team D three weeks ahead. Read down any column and you will find exactly one D and one N, which is what gives you 24/7 coverage.

A few things stand out once you see the grid. Every team works 168 hours over the 28 days, but no team works 42 hours in any single week. Each team gets one week with no shifts at all. And with the cycle starting on a Monday, every team has two full weekends off out of four, while the other two weekends fall inside a work block. After day 28 the grid repeats from day 1, so you can print it once and use it all year.

If you want a blank version to fill in with your own names, our work schedule templates include rotation layouts you can copy.

Hours and overtime on a 12 hour rotating shift

The 42-hour average is accurate, but it is not what payroll sees. Under the Fair Labor Standards Act, a non-exempt employee earns at least 1.5 times the regular rate for hours over 40 in a workweek. Federal regulation 29 CFR 778.104 says the FLSA takes a single workweek as its standard and does not permit averaging hours over two or more weeks. So a 12 hour rotating shift pattern that averages 42 hours can still produce a lot more than 2 hours of overtime a week.

Here is Team A at an illustrative $24.00 an hour, with the workweek starting Monday at 7:00 a.m. Under 29 CFR 778.105, a workweek can begin on any day and at any hour, and starting it at shift change keeps every 12-hour shift inside one week.

The math for week 2: 40 × $24.00 = $960.00, plus 32 × $36.00 = $1,152.00, for $2,112.00. Over the full cycle, straight time is 168 × $24.00 = $4,032.00 and the overtime premium is 48 × $12.00 = $576.00. That premium is built into the schedule. If you had averaged the hours, you would have paid $4,032.00 plus only 8 hours of premium ($96.00), which would underpay each employee by $480.00 per cycle.

Where the workweek starts moves hours around. With a workweek that starts Monday at midnight instead, the last night shift of week 2 (Sunday 7 p.m. to Monday 7 a.m.) splits: 5 hours land in week 2 and 7 hours in week 3. Week 2 becomes 65 hours (25 overtime) and week 3 becomes 55 hours (15 overtime). In this cycle the total is still 48 overtime hours and $4,608.00, but in other patterns the split can change the total. Hours always count in the workweek in which they are actually worked, so pick a workweek start, write it down and do not change it to avoid overtime. Our guide on how to calculate overtime walks through the regular rate method step by step, and the overtime calculator checks a single week.

California daily overtime on a DuPont rotation

Be careful with a DuPont rotation in California. The California Division of Labor Standards Enforcement says non-exempt employees earn time and a half for hours over 8 in a workday and over 40 in a workweek, and double time for hours over 12 in a workday and over 8 on the seventh consecutive day of a workweek. Every 12-hour shift therefore carries 4 hours of daily overtime, even in a week with only 48 hours.

Using the same Team A at $24.00 an hour, with each workday and the workweek starting at 7:00 a.m. so every shift sits in one workday:

• Weeks 1 and 3 (4 shifts): 32 regular hours and 16 daily overtime hours. Pay: 32 × $24.00 + 16 × $36.00 = $1,344.00.
• Week 2 (6 shifts): 48 hours fall in the first 8 of each day, but only 40 can be regular, so 8 become weekly overtime on top of 24 daily overtime hours. Pay: 40 × $24.00 + 32 × $36.00 = $2,112.00.
• Cycle total: 64 overtime hours and $4,800.00, or $192.00 more per employee per cycle than under federal law alone.

A DuPont schedule never has seven consecutive work days, so the seventh-day rule is not triggered by the base rotation. Double time starts the moment a shift runs past 12 hours, which happens when someone is held over for a late relief. California’s alternative workweek rules generally cap regular days at 10 hours, with a separate option for 12-hour days in health care, and long shifts bring second meal periods and extra rest breaks. Read our California overtime law guide before you adopt this pattern there, and check other states with daily overtime rules too.

Night shift differential on the DuPont rotation

On a DuPont schedule every employee works nights half the time: 7 of the 14 shifts in each cycle. Many employers pay a night premium to recognize that. The US Department of Labor says the FLSA does not require extra pay for night work. If you pay one, though, 29 CFR 778.207(b) requires night differentials to be included in the regular rate used for overtime.

Take Team A’s week 1 again, four night shifts at $24.00 an hour with an illustrative $1.50 night differential:

1. Straight-time pay: 48 × $24.00 = $1,152.00.
2. Differential: 48 × $1.50 = $72.00.
3. Regular rate: ($1,152.00 + $72.00) ÷ 48 = $25.50 an hour.
4. Overtime premium: 8 × $25.50 × 0.5 = $102.00.
5. Total: $1,152.00 + $72.00 + $102.00 = $1,326.00.

That is $78.00 more than the same week without the differential: $72.00 of premium plus $6.00 of extra overtime. Our shift differential guide covers flat-dollar and percentage premiums, and how to handle a shift that only partly falls in the night window.

Pros and cons of the DuPont schedule

What employees and managers like:

• Seven days off in a row every four weeks, without using any PTO. Add a few PTO days around it and the break gets longer.
• Fewer commutes. Fourteen trips to work in 28 days instead of about twenty on a five-day week.
• Fewer handoffs. Two shift changes a day instead of three on 8-hour shifts, which means fewer chances for information to get lost.
• Predictable for years. The rotation never changes, so people can plan holidays and appointments far ahead.
• Even sharing of nights and weekends. Every team works the same mix, which feels fair.

What makes it hard:

• Twelve-hour shifts are long, and once you add a commute, the workday leaves little time for anything but sleep.
• A 72-hour week. The middle block of three days, one day off and three nights is the toughest part of the cycle.
• One day off between days and nights. Moving from a day block to a night block with a single day in between is hard on sleep.
• Built-in overtime cost. Three of four weeks go over 40 hours, so labor cost is higher than the 42-hour average suggests.
• No spare crew. A sick call means holding someone over past 12 hours or calling in a person on days off.
• Child care and second jobs are hard to fit around a pattern that changes every few days.

Fatigue and safety on 12-hour shifts

Long, rotating shifts carry real safety trade-offs, and the research is worth knowing before you choose a 12-hour pattern. The National Institute for Occupational Safety and Health (NIOSH), part of the CDC, states in its training for nurses on shift work and long hours that, compared with 8-hour shifts, risks for accidents and errors increase by 28% for 12-hour shifts. The same NIOSH material lists night shifts as carrying a 28% higher risk than day shifts that start after 7:00 a.m. A 2004 NIOSH review of research on overtime and extended work shifts (Publication 2004-143) found the evidence mixed and called for more study, so treat these as warning signs rather than precise predictions for your site.

The DuPont pattern has some features that help: no more than four shifts in a row, and longer breaks after night blocks. It also has the 72-hour week and fast changes between days and nights. Practical steps that reduce risk:

• Cap holdovers. Set a written limit on how long anyone may work past a 12-hour shift, and how many hours off they must get before the next one.
• Protect breaks. Schedule meal and rest breaks on every shift, especially the last hours of a night.
• Watch the commute home. Drowsy driving after a night shift is a common worry. Some sites offer a rest area or encourage carpooling.
• Put the hardest tasks early. Where you can, schedule safety-critical or detailed work away from the last hours of a night shift.
• Limit overtime on top of the rotation. Picking up extra shifts during the seven days off removes the recovery the pattern is built around.

For your own operation, review guidance from NIOSH and your safety team, and listen to the people working the rotation.

Who uses the DuPont schedule

The DuPont schedule fits operations that cannot close and want the same people to cover nights and days over time:

• Manufacturing and process plants, such as chemical, paper, food and plastics plants, where shutting a line down and restarting it is expensive.
• Utilities, including power generation, water and wastewater treatment, and control rooms that need trained operators at all hours.
• Health care, such as hospitals and residential care, where 12-hour shifts are already common. Our guide to healthcare scheduling software covers tools for clinical rotations.
• Public safety, including police patrol, fire departments, 911 dispatch and corrections.

It is a poor fit for businesses with peaks at certain hours, like a restaurant or a retail store, where the number of staff needed changes through the day. Those teams usually do better with a weekly schedule built around demand.

DuPont vs Pitman, 2-2-3 and Panama schedules

DuPont is one of several four-team, 12-hour rotations. The names Pitman, 2-2-3 and Panama are used inconsistently from one employer to the next, so confirm how your site or union contract defines them. The most common versions compare like this:

The trade-off is simple. DuPont gives employees a full week off but asks for a hard middle stretch. Pitman-style patterns spread the time off into shorter, more frequent breaks, with every other weekend off as a three-day weekend. Read our guides to the Pitman schedule and the 2-2-3 schedule for full grids and overtime examples of each.

How to set up a DuPont rotation

If you are moving a team to a DuPont schedule, these steps prevent most problems:

1. Build balanced teams. Each team needs the same licenses, certifications and lead roles, because each one runs the site alone for 12 hours.
2. Fix the workweek and shift times. Choose a workweek start (for example Monday at 7:00 a.m.) and shift change times, write them in your policy, and set payroll to match.
3. Budget the overtime. Model each team’s weekly hours, not the 42-hour average, and add your state’s daily rules if any apply.
4. Write a swap and coverage policy. Decide who approves swaps, the maximum hours in a row, and the order for calling in off-duty staff.
5. Plan PTO around the rotation. One 12-hour shift off uses 12 hours of PTO, not 8. Tell staff how leave is counted before they request it.
6. Track actual hours. Holdovers and early relief change real hours. Use a time clock app so overtime comes from punches, not the planned grid.

Frequently asked questions