Firefighters work 24-hour shifts because fire stations need to be staffed around the clock, and long shifts are the most practical way to do that with a small workforce. The system dates back to the 1800s, when early American firefighters didn’t work shifts at all. They lived at the firehouse full-time. As the profession evolved, 24-hour rotations became the standard compromise between constant coverage and giving firefighters time at home.
How the 24-Hour Shift Started
In the earliest days of organized firefighting in the United States, firefighters essentially resided at their stations. There was no concept of clocking in and out. As cities grew through the late 1800s and early 1900s, the demand for round-the-clock fire protection intensified. Firehouses were built strategically across cities to reach every neighborhood at any hour.
But living at the station permanently wasn’t sustainable for people with families. Firefighters began requesting a day off for every day worked so they could go home. That basic arrangement, one day on and one day off, became the foundation for the shift schedules still used today. The 24-hour block stuck because it was the simplest way to divide a full day of coverage between rotating crews.
Why Not Use 8- or 12-Hour Shifts Instead
Most jobs cap shifts at 8 or 12 hours. Firefighting is different for several practical reasons. First, fire departments are relatively small organizations covering large areas. Splitting a 24-hour day into two or three shorter shifts means you need two or three times as many shift changes, which creates gaps in coverage during crew transitions. It also requires more total personnel or more frequent commutes for the same workforce.
Second, firefighting involves long stretches of standby time punctuated by emergencies. Unlike a nurse or factory worker who is actively working for most of a shift, firefighters spend significant portions of a 24-hour shift training, maintaining equipment, doing station chores, and sleeping. The intensity of the work is unpredictable, not constant, which makes longer shifts more feasible than they would be in jobs requiring sustained physical or mental output for every hour.
When departments have surveyed their own personnel about switching to shorter shifts, the pushback is strong. In one FEMA-documented evaluation, firefighters asked to rate their interest in shifts shorter than 24 hours overwhelmingly chose the lowest possible score. The most common objection was economic: shorter shifts mean commuting to the station more often, which costs more in gas and time. Firefighters also cited increased daycare costs and the loss of income from side jobs they hold on their days off.
Common Schedule Rotations
The 24-hour shift is the building block, but how those shifts are strung together varies by department. Most U.S. fire departments use three platoons (also called crews or shifts) that rotate through the schedule to keep stations covered at all times.
- 24/48: One day on duty, two days off. This is the most common schedule in American fire departments. The cycle repeats every three days.
- 48/96: Two consecutive days on duty, four days off. This is growing in popularity. Research comparing it to the 24/48 found that firefighters on the 48/96 schedule got more sleep, experienced less burnout, and reported less daytime sleepiness.
- Kelly schedule: A variation where firefighters work 24 on, 24 off, 24 on, 24 off, 24 on, then get 96 hours (four days) off. It averages out to a similar number of hours but clusters the work differently.
All three schedules result in firefighters averaging roughly 48 to 56 hours per week, depending on the department. That’s significantly more than a standard 40-hour workweek, which is where federal labor law comes in.
How Federal Law Supports Long Shifts
Under the Fair Labor Standards Act, most American workers earn overtime after 40 hours in a week. Firefighters have a special exemption. Section 7(k) of the FLSA allows fire departments to calculate overtime over a longer “work period” of up to 28 consecutive days. For fire protection employees, overtime kicks in after 212 hours in a 28-day period, or proportionally, after 106 hours in a 14-day period.
This means a firefighter can work 53 hours a week before overtime applies, compared to 40 for most other workers. The exemption exists specifically because the nature of fire protection requires extended on-duty periods that don’t fit neatly into a standard workweek. Without it, every 24-hour shift would automatically trigger overtime pay, making the schedule financially impossible for most city budgets.
The Commuting and Housing Factor
One of the biggest practical reasons the 24-hour shift persists is commuting. In many parts of the country, especially high-cost metro areas, firefighters can’t afford to live near their stations. Some commute 100 miles or more each way. A firefighter living two to four hours from work can manage that commute 10 times a month on a 24/48 schedule. Switching to 12-hour shifts would double those trips to 20, adding hundreds of dollars in fuel costs and dozens of hours on the road every month.
Departments that have studied longer shifts, like the 48/96, found that one of the most commonly cited benefits was reduced commuting. Firefighters in expensive coastal cities like Hermosa Beach, California, reported that the 48-hour shift made it possible to live in more affordable areas farther from the station while still maintaining a reasonable quality of life. Seven out of 14 fire organizations in one FEMA study reported that firefighters viewed longer shifts as a direct benefit to their careers, largely because of the lifestyle flexibility.
The Health Tradeoffs
Working 24 hours straight is not without consequences. Sleep disruption is the most obvious one. Firefighters are allowed to sleep during overnight hours when no calls come in, but busy stations may run calls throughout the night. Even on quieter nights, the possibility of being woken by an alarm affects sleep quality.
Research has consistently linked disrupted sleep in firefighters to higher rates of burnout and daytime sleepiness. Studies comparing different schedule formats found that the 48/96 rotation improved sleep duration and reduced burnout compared to the traditional 24/48, likely because the four consecutive days off allow for more complete recovery between duty cycles. The 24/48, by contrast, gives only two days off, and one of those is often spent recovering from sleep debt rather than genuinely resting.
Departments are increasingly aware of these tradeoffs. The shift toward 48/96 schedules in recent years reflects a growing recognition that how the 24-hour blocks are arranged matters as much as the length of any single shift. Giving firefighters longer uninterrupted recovery periods appears to offset some of the fatigue that accumulates during extended duty.
Why the System Persists
The 24-hour shift endures because it solves multiple problems at once. It keeps stations staffed with fewer shift changes and fewer total commutes. It fits within a federal labor framework designed for fire protection work. It gives firefighters extended time off that supports second jobs, family life, and long-distance commuting. And it aligns with the unpredictable rhythm of emergency work, where crews need to be available for surges of intense activity but aren’t performing continuous labor for the full 24 hours.
Switching to shorter shifts would require hiring significantly more personnel or paying substantially more overtime. When Anne Arundel County, Maryland, proposed moving firefighters from a four-platoon system to a three-platoon system in 2013, the projected savings were about $7 million a year, but it required firefighters to work additional shifts. Moving in the opposite direction, toward more platoons and shorter shifts, would carry costs most municipal budgets can’t absorb. The 24-hour shift isn’t a relic that departments haven’t gotten around to changing. It’s a deliberate staffing strategy that, despite real health concerns, remains the most workable solution for round-the-clock emergency coverage.