Introduction

For many 24-hour operations, the 12-hour shift appears efficient.

Two shifts can cover an entire day, there are fewer handovers, supervisors coordinate fewer teams, and the organisation may operate with fewer employees. Employees may also appreciate the additional earnings that come with overtime.

For these reasons, 12-hour shifts are common in manufacturing, security, logistics, warehousing, processing plants and other continuous operations.

But at some point, management should stop asking only:

“Are we paying overtime correctly?”

and start asking:

“Why does our operating model require this much overtime in the first place?”

That is the difference between treating overtime as a payroll matter and treating it as a workforce-design issue.

Where employees work substantial overtime every week and every month, overtime may no longer be responding to exceptional demand. It may have become the organisation’s permanent staffing model.

That can affect compliance, payroll cost, productivity, employee relations, safety and long-term workforce planning.

Is a 12-Hour Shift Illegal in Kenya?

Not simply because it lasts 12 hours.

A shift should be assessed as part of the employee’s complete working arrangement.

Employers need to consider the applicable Wage Order, weekly working hours, days worked, night work, overtime, rest days, public holidays, breaks, employment contracts and any applicable collective bargaining agreement.

Section 27 of the Employment Act requires employers to regulate working hours in accordance with the law and provides employees with at least one rest day in every seven-day period.

For employees covered by the Regulation of Wages (General) Order, normal hours and overtime are also regulated.

Importantly, the General Order limits the combined total of normal hours and overtime over two consecutive weeks.

The combined hours should not exceed:

144 hours over two consecutive weeks for employees engaged in night work, and

116 hours over two consecutive weeks for other adult employees.

These limits become particularly important where employers operate permanent 12-hour rosters.

Consider a 12-Hour × 6-Day Roster

Suppose an employee works:

12 hours per day × 6 days per week.

That equals:

72 scheduled hours per week, or

144 scheduled hours over two consecutive weeks.

For an adult employee who is not engaged in night work and who is covered by the General Order, 144 hours exceeds the 116-hour combined normal-and-overtime ceiling.

For an employee genuinely engaged in night work, 144 hours reaches the relevant two-week ceiling.

That leaves little or no room for an extended handover, breakdown response, emergency call-out, delayed relief or additional shift.

The employer should therefore not simply calculate the overtime due and consider the matter closed.

The working pattern itself requires review.

Paying Overtime Does Not Automatically Make the Shift Structure Compliant

Overtime pay and working-time compliance are related, but they are not the same issue.

The Regulation of Wages framework provides for qualifying overtime at one-and-a-half times the normal hourly rate, with different treatment for work performed on rest days and public holidays.

Where overtime is due, it should be paid correctly.

But paying overtime does not automatically answer the question:

Was the employee supposed to be rostered for that amount of working time in the first place?

An employer should therefore avoid assuming:

“We pay everyone overtime, so the 12-hour roster is compliant.”

Overtime payment addresses remuneration.

Working-hours rules address the structure and duration of work.

Both need to be reviewed.

The 225-Hour Rule Is Often Misunderstood

The figure 225 is frequently mentioned in Kenyan overtime discussions.

Under the General Order, it is used as part of the statutory basis for calculating an hourly rate for overtime where an employee is not employed by the hour.

It should not automatically be interpreted as:

“The maximum number of hours an employee can legally work in one month.”

Working-time compliance also depends on weekly normal hours, rest requirements and the two-week limits discussed above.

The 225 divisor therefore has an important payroll function, but it should not replace analysis of the actual roster.

When Overtime Stops Being Overtime

Overtime is normally associated with exceptional circumstances.

For example:

a production deadline, unusual customer order, unexpected absence, machinery breakdown, seasonal demand or one-off project.

But what happens when the same employees work significant overtime every week, every month and throughout the year?

At that point, the organisation may not be dealing with temporary overtime.

It may be understaffed for the hours it expects to operate.

This leads to one of the most useful workforce-planning questions management can ask:

Is overtime solving temporary demand, or compensating for permanent understaffing?

The answer can significantly change how management approaches headcount.

The Two-Shift Model

A common continuous-operation structure is:

Shift 1: 6:00 a.m. – 6:00 p.m.

Shift 2: 6:00 p.m. – 6:00 a.m.

The operational attraction is straightforward.

Two teams can cover 24 hours.

However, where employees regularly work long weeks, the organisation may also be carrying substantial recurring overtime, working-hours exposure, fatigue risk, dependence on individual employees and increased absence-cover requirements.

Employees may also become financially dependent on overtime as part of their normal monthly earnings.

Management should therefore calculate the true cost of the shift system, not merely look at the number of employees on payroll.

What Would a Three-Shift Model Look Like?

An alternative structure could be:

Shift 1: 6:00 a.m. – 2:00 p.m.

Shift 2: 2:00 p.m. – 10:00 p.m.

Shift 3: 10:00 p.m. – 6:00 a.m.

The organisation still achieves 24-hour coverage, but the workforce operates on three 8-hour shifts instead of two 12-hour shifts.

Six 8-hour working days would produce 48 scheduled hours per week before considering the applicable Wage Order, contractual terms and any sector-specific arrangements.

The obvious disadvantage is that the organisation needs more employees.

That may initially appear expensive.

But headcount alone does not determine the true cost of the operating model.

More Employees Can Sometimes Cost Less Than More Overtime

When management says:

“We cannot introduce another shift because we would need to employ too many people,”

the conclusion may be correct.

But it should be tested.

The proper comparison is not simply:

current headcount vs additional headcount.

Management should compare:

Current workforce cost

Basic pay + housing + structural overtime + rest-day/public-holiday costs + overtime-related payroll exposure

against:

Alternative workforce cost

Additional headcount + basic pay + housing + employer statutory costs + benefits + recruitment + PPE + training + supervision + other employment costs

Only then can management determine which model actually costs more.

In some organisations, recurring overtime across a large workforce may already be sufficiently expensive to fund a significant portion of another shift.

This does not mean every employer should move to three shifts.

It means the decision should be modelled rather than assumed.

Calculate the Break-Even Point

This is where HR and Finance should work together.

An additional employee costs more than basic salary.

Employers may also need to consider:

statutory employer contributions, recruitment, onboarding, uniforms, PPE, medical benefits, meals, transport, training, leave cover, HR administration, payroll administration, workspace, equipment and additional supervisory capacity.

The better question therefore becomes:

How much can the organisation spend per additional employee before the alternative shift model becomes more expensive than the overtime it eliminates?

That is the break-even point.

It changes the discussion from:

“More employees are expensive.”

to:

“At what headcount and employment cost does the alternative shift become more or less economical?”

That is a far stronger management question.

Do Not Ignore Employees Who Depend on Overtime

There is also an employee-relations dimension.

Where employees have worked structural overtime for years, the additional overtime income may effectively form part of their expected monthly earnings.

An employee may receive:

Basic salary + housing allowance + substantial recurring overtime.

Management may view a new shift arrangement as a compliance and efficiency improvement.

Employees may experience the same change as:

“My monthly earnings have been reduced.”

Both perspectives can exist at the same time.

Shift restructuring should therefore be treated as an employee-relations and change-management exercise, not only as a scheduling decision.

Employers should consider contracts, CBAs, employee communication, consultation, union engagement where applicable, transitional arrangements, productivity expectations and salary positioning.

A technically efficient roster can still fail if the workforce implications are not managed properly.

Shift Design Is Also a Safety Question

Working hours should not be reviewed only through payroll.

The Occupational Safety and Health Act places broad obligations on employers to maintain safe systems and procedures of work and an environment that does not expose employees to unnecessary health and safety risks.

For organisations using long shifts, management should therefore ask:

Do errors increase towards the end of the shift?

What happens to productivity during hours 9 to 12?

Are near misses concentrated at particular times?

Are machine incidents associated with specific shifts?

Are employees taking adequate breaks?

Do night-shift employees have higher absence or turnover?

How often do employees remain beyond their scheduled shift?

Are handovers being performed safely?

The issue is not that every 12-hour shift is inherently unsafe.

The point is that working-time design should form part of the organisation’s overall safe-system-of-work assessment.

A CBA Can Change the Analysis

The General Order may not be the only instrument governing working time.

A registered Collective Bargaining Agreement can provide more favourable working hours and overtime arrangements.

For example, a 2024 ELRC dispute involving Weetabix East Africa considered a CBA providing for a 45-hour working week over five days, with issues arising around overtime in a 12-hour shift environment.

Employers should therefore identify the full hierarchy of applicable terms:

Employment Act → applicable Wage Order → CBA → employment contract → established more favourable terms.

A shift structure cannot be properly reviewed without knowing which binding terms apply to the particular workforce.

Attendance Records Matter More Than the Planned Roster

Another common mistake is assuming that the roster proves the hours employees actually worked.

It does not.

A proper working-hours review should reconcile:

Planned roster → biometric attendance → overtime approvals → payroll payments

Employees may arrive late, leave early, cover another shift, work through a break, remain for handover, return for a call-out or work on a scheduled rest day.

These events may not be visible from the planned roster.

Attendance, biometric and payroll records therefore become critical where overtime is disputed.

For employers using extended shifts, records should be capable of reconstructing what actually happened.

Seven Signs Overtime Has Become a Workforce-Design Problem

Management should investigate further where:

1. The same employees receive significant overtime every month.
2. Overtime represents a substantial share of payroll.
3. Employees’ monthly earnings depend heavily on overtime.
4. Departments cannot operate within normal hours at current headcount.
5. Employees regularly approach working-time limits.
6. One employee’s absence automatically creates overtime for another.
7. Management has never compared the existing roster with another staffing model.

Where several of these conditions exist, the organisation may no longer have an overtime problem.

It may have a workforce-capacity problem.

What Should Management Model Before Changing Shifts?

A proper shift review should examine five areas.

1. Legal Compliance

What normal hours, overtime rules, rest-day requirements, Wage Orders, CBAs and contractual terms apply?

2. Payroll Cost

What does the existing shift truly cost after structural overtime, housing and recurring payments are included?

3. Alternative Headcount

How many employees would another shift arrangement require?

4. Employment On-Costs

What would each additional employee cost beyond salary?

5. Operational Impact

Would the new arrangement improve or weaken productivity, supervision, handovers, maintenance, absence cover and operational continuity?

Only after analysing these areas should management decide whether the current roster remains the best option.

Do Not Automatically Choose the Cheapest Model

The lowest payroll cost is not always the best workforce model.

A third shift may reduce overtime but increase recruitment needs, training requirements, supervision complexity, night-work challenges and handovers.

Likewise, a properly structured 12-hour system may still offer genuine operational advantages in some environments.

The objective is not simply:

“Eliminate overtime.”

The objective is:

Design the workforce model that best balances compliance, cost, productivity, safety and employee sustainability.

That is a strategic workforce decision.

Frequently Asked Questions About 12-Hour Shifts in Kenya

Are 12-hour shifts legal in Kenya?

A 12-hour shift is not assessed solely by its duration. Employers must review the applicable Wage Order, weekly hours, overtime, rest days, two-week working-hour limits, contracts and any applicable CBA.

Does paying overtime make a 12-hour shift compliant?

Not automatically. Correct overtime payment addresses remuneration, while working-hours rules determine whether the shift structure itself is compliant.

Can employers use three 8-hour shifts instead?

Yes, where operationally appropriate. However, employers should first model headcount, applicable working-time rules, payroll cost, statutory obligations, productivity and employee-relations implications.

Is a three-shift model always cheaper?

No. Its cost depends on the full cost of additional employees compared with the amount of structural overtime currently being paid.

Can employees object when overtime reduces?

A shift redesign may materially affect earnings and working arrangements. Employers should review employment contracts, CBAs, established practices and consultation requirements before implementing major changes.

Should biometric attendance be reconciled with payroll?

Yes. Planned shifts, actual attendance, approved overtime and payroll should ideally reconcile and create a clear audit trail.

The Real Question Is Not “How Much Overtime Are We Paying?”

Management should ask:

Why are we paying it?

How often are we paying it?

Which roles and departments are driving it?

Are the hours compliant?

Would additional employees cost less?

How would employees be affected if overtime reduced?

Is the current shift structure still the right model for the business?

When management can answer these questions, overtime becomes something that can be governed rather than simply processed.

That is the difference between running payroll and managing workforce cost.

Is Your Shift Structure Still the Right One?

ACCUREX Human Capital Hub supports organisations with working-hours reviews, overtime analysis, shift modelling, payroll compliance, workforce-cost analysis, job evaluation, salary grading, HR outsourcing and workforce restructuring.

For manufacturers and other organisations operating extended shifts, ACCUREX can evaluate current working arrangements against alternative shift and staffing scenarios and assess the implications for payroll cost, compliance, headcount, safety and employee relations.

Talk to ACCUREX about a Shift, Overtime & Workforce Cost Review before changing headcount—or assuming your existing roster is still the most economical option.

www.accurex.co.ke or email info@accurex.co.ke

This article provides general HR and employment-practice guidance and is not a substitute for legal advice. Employers should review the applicable Wage Order, collective bargaining agreement, employment contracts and specific workforce circumstances before changing working hours, overtime arrangements or shift structures.