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DDNNOO schedule
Two day shifts, two night shifts, two days off — six days from start to repeat, and the fastest flip between days and nights of any named pattern.
Also called: 2-2-2 days and nights
- Shift length
- 12 hours
- Cycle
- 6 days
- Average week
- 56 hours
- Crews
- 3
What the DDNNOO schedule is
Two twelve-hour day shifts, two twelve-hour night shifts, then two days off. Six days round.
The name is the pattern read out: D, D, N, N, O, O. It turns up under that spelling far more often than under any phrase, which is why it is worth knowing.
It is a fast rotation by design. Nobody spends long enough on either tour to settle into it, and the argument for that is that nobody spends long enough on nights to be worn down by them either.
How the cycle runs
One six-day cycle:
Set a start day, set the length to 6 days, and paint each one. This pattern walks, so each time round it lands on different weekdays — which the app works out for you.
Start day: 1 September 2026Days: 6
Day shiftNight shift24-hour tourDay off
Set the template once. Your days show up on every month after it.
September 2026
Print this rotation (PDF) One page — the cycle above, and a blank grid for your own dates.
BlueShifts. Plan Your Year. Own Your Time.
The shift calendar built for your rotation, off-duty work, and life on and off the clock.
Save this pattern once and the year fills itself in — forward as far as you want, and back over the months you have already worked.
Weekends off on this rotation
This cycle is 6 days, which does not divide by seven — so it drifts through the week and every squad gets much the same share. Around 8 to 9 full weekends a year, wherever you sit in it.
A year on this rotation: 9 full weekends off, spread through the calendar. A weekend counts only when both the Saturday and the Sunday are free. All 21 rotations compared →
The fast flip
Turning from a night shift to a day shift with two days between them is the hardest thing this pattern asks. Sleep research is not kind to fast rotations, and this is about as fast as they come in continuous operations.
What people who work it say in its favour is that the night block is never longer than two, and the break arrives immediately after it.
Three crews cover the clock, which is fewer than most twelve-hour patterns need — and that is usually the reason a department is running it.
Hours and the work period
Four twelve-hour shifts every six days averages fifty-six hours a week, which is well above a standard full-time week and matches what a 24/48 fire schedule works.
Anything averaging fifty-six hours makes the work period definition and the overtime threshold worth understanding properly, because a weekly threshold and an extended work period give very different answers.
Who works it
Continuous operations running three crews:
- Industrial and plant operations
- Corrections and detention
- Security operations
- Some dispatch centres
- Utilities
- Transport and logistics
The trade-off
What works
- Never more than two nights in a row
- A break immediately after every night block
- Only three crews needed for full cover
- Short cycle, easy to remember
What hurts
- Fifty-six hour average weeks
- The fastest days-to-nights flip of any named pattern
- Only two days off between blocks
- Six-day cycle drifts through the week
Put it on your calendar
Working it out by hand is where the mistakes happen.
Save the pattern once and BlueShifts fills the calendar in, forward and back.
Common questions
What does DDNNOO stand for?
Day, day, night, night, off, off — the six-day cycle read out as letters.
How many hours a week is DDNNOO?
About fifty-six on twelve-hour shifts.
Is it the same as 2-2-2?
Only when 2-2-2 is written as two days, two nights, two off. The letters are unambiguous, which is why they are used.
Put the DDNNOO schedule on your calendar
Save the DDNNOO schedule once, tell BlueShifts the day your cycle starts, and the rest of the year draws itself. Then the off-duty work you pick up around it goes in beside the shifts.
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