DuPont schedule

The DuPont schedule is a 4-week rotating shift pattern that uses 12-hour shifts and four crews to provide continuous 24/7 coverage, alternating between blocks of night shifts, day shifts, and days off.

Originally developed by the DuPont corporation, the pattern became standard in industries that never stop running, including chemical manufacturing, oil refining, and healthcare. It averages 42 hours per week across the full cycle and builds in a stretch of 7 consecutive days off every four weeks.

How the DuPont schedule works

Four crews (typically labeled A, B, C, and D) rotate through the same fixed sequence, each offset by one week. The pattern looks like this:

Week 1: N N N N - - - Week 2: D D D - N N N Week 3: - - - D D D D Week 4: - - - - - - -

(N = night shift, D = day shift, - = day off)

No crew works more than four consecutive shifts before getting time off. Every transition between night and day includes at least one rest day. The 7-day block in week 4 closes the cycle before it repeats.

How it compares to other shift patterns

Compared to standard 8-hour rotating shifts, the DuPont schedule means fewer handovers per week and longer recovery windows, with longer individual shifts as the trade-off. Compared to the Panama schedule (a 2-2-3 pattern), DuPont offers a cleaner separation between day and night rotations and longer time-off blocks, but the full cycle takes twice as long to complete.

Common challenges

Twelve-hour shifts are physically demanding, and rotating between day and night across four weeks makes it hard to keep a consistent sleep routine. The pattern also requires exactly four crews to work as designed. Teams with fewer people will see gaps in coverage, so headcount planning matters before committing to this schedule.

How Zelos helps

Zelos works alongside existing roster tools for teams running the DuPont schedule. When a planned shift needs to be filled or a team member wants to swap, Zelos makes it straightforward to open that slot for signup without rebuilding the whole schedule. It fits naturally into operations where the base rotation is fixed but day-to-day flexibility is still needed.