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Staffing math

How do you schedule 6 people to cover 24/7?

With one person on duty, 6 people means 28 hours each. The real question is why you have 6, and the answer decides the roster.

The short answer

6 people can cover 24/7 with one person on duty: 168 weekly coverage hours split 6 ways is an average of 28 hours per person, leaving real slack for holidays, sickness, and training.

Coverage window
24/7
Hours to staff / week
168
Shift length
12h
Shifts to fill / week
14
Hours each
28h
With absence buffer
6 people

Why the math lands there

A single 24/7 post is 168 staffed hours a week, and shared across 6 people that is an average of 28 hours each, about 2.3 twelve-hour shifts a week. That sits comfortably below any legal threshold and leaves so much slack that vacations and sick days barely dent the plan. It is also less than most full-time contracts pay for, which is the first clue that a 6-person roster is rarely about a single post.

Six almost always means the coverage need is not flat. Operations arrive at this headcount for one of three reasons: they want a truly resilient single post, they need a second person on duty for part of the day, or the work takes a whole crew at once. Each reason produces a different schedule, and mixing them up produces the wrong one.

The arithmetic boundary is worth knowing before you pick. Two people on duty around the clock would double the load to 336 staffed hours, or 56 hours per person across 6, which is over the 48-hour average cap the EU applies. So 6 people can double up for part of the day, but not for all of it.

  1. 124 hours a day times 7 days a week = 168 coverage hours to staff every week.
  2. 2168 hours divided into 12-hour shifts = 14 shifts to fill every week.
  3. 3168 hours divided by 6 people = an average of 28 hours per person per week, or 2.3 shifts each.
  4. 4Nobody works every scheduled week. With a typical 20 to 25 percent allowance for leave, sickness, and training, plan for 6 people to keep the roster from running on overtime.

Headcount options, side by side

The same 168 weekly coverage hours spread over different team sizes. Average weekly hours per person is the number that decides whether a roster is sustainable, legal, and affordable.

PeopleHours / person / weekShifts / person / weekVerdict
3564.7Over legal limits in most countries
4423.5Built-in overtime
533.62.8Standard workload
6this page282.3Slack for absence
7242Slack for absence
8211.8Slack for absence

The absence buffer above assumes 20 to 25 percent of paid time goes to leave, sickness, and training. Your own rate decides the real number, which you can work out with our shrinkage calculator.

What the arithmetic does not tell you

If the honest requirement is one person on duty with resilience, run a familiar 4-team rotation such as 2-2-3 and treat the remaining 2 people as relief. They absorb leave, sickness, and training, take regular slots to pull averages down, and give you a bench when someone resigns. This is the calmest 24/7 roster there is, and its cost is paying 6 salaries for one chair.

If demand peaks in the daytime, split the headcount unevenly: single coverage overnight and doubled coverage through the day. That looks tidy on paper and gets messy in practice, because the doubled day slots and single night slots rotate at different rhythms, and fairness disputes surface exactly at the seams. Write down who owns nights before you publish week one.

If the work itself needs several sets of hands at once, you do not have a 6-person single post at all, you have 2 crews of 3, and the natural schedule is a crew rotation such as 7-on-7-off: a week on and a week off at a 42-hour average. Crew scheduling fails differently: one absence weakens a whole crew, so cross-crew swap rules need to exist from day one.

Once the headcount is settled, the daily work is keeping the roster fair and covered as people swap, call in sick, and take leave. That is the part Soon automates, from constraint-aware auto-scheduling to leave management.

Frequently asked questions

How many hours does each person work if 6 people cover 24/7?
With one person on duty, 168 weekly coverage hours across 6 people averages 28 hours each, roughly 2.3 twelve-hour shifts a week. That is below a standard full-time contract, so pure single-post coverage with 6 people usually means part-time contracts or deliberately buying slack.
Can 6 people keep 2 on duty around the clock?
No, not sustainably. Two people on duty for all 168 hours is 336 staffed hours a week, which is 56 hours per person across 6, above the EU Working Time Directive's 48-hour average cap. Around-the-clock double coverage needs 8 people at a 42-hour average, the same math as two separate 4-team rotations.
What is the best schedule for 6 employees running 24/7?
It depends on why you have 6. For a resilient single post, a 4-team rotation like 2-2-3 plus 2 relief people is the calmest option. For daytime peaks, run single night coverage with doubled day coverage. For crew work, run 2 crews of 3 alternating weeks on 7-on-7-off.
Is 6 people too many for a single 24/7 position?
By the raw math the floor is 5 people at 33.6 hours, and 6 is exactly what a 25 percent absence buffer recommends. So 6 is not too many, it is the resilient number. What the sixth salary buys is the difference between absence being routine and absence being overtime.
Should the 2 extra people be dedicated relief or part of the rotation?
Rotate the relief role unless you have volunteers who genuinely prefer it. Permanent relief people get the least predictable schedules, absorb the least popular slots, and burn out first. A rotating relief week shares that load and keeps all 6 people current on the post.

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