Under US labor law, there is no maximum length for a work day for adult employees. The Fair Labor Standards Act measures work on a weekly basis, not a daily one, and it requires overtime pay only after 40 hours in a seven-day workweek.1U.S. Department of Labor. Fact Sheet 23: Overtime Pay Requirements of the FLSA An employer can legally schedule a 10-, 12-, or 16-hour shift without breaking federal law. A few states and certain safety-sensitive industries do impose daily limits, and workers under 16 have their own caps.
No Federal Limit on Hours Per Day
The FLSA does not set a maximum number of hours an employer can require from workers aged 16 and older in a single day. The eight-hour workday familiar to most people is a product of collective bargaining and workplace custom, not federal statute. Because the law tracks time weekly, a long day only becomes a federal legal issue when it drives your weekly total past 40 hours.
Overtime Kicks In After 40 Hours a Week
Once you work more than 40 hours in a single workweek, every additional hour must be paid at one and one-half times your regular rate.2Office of the Law Revision Counsel. 29 USC 207 – Maximum Hours A workweek is a fixed, recurring block of 168 hours, meaning seven consecutive 24-hour periods, and your employer defines when it starts. It doesn’t have to begin on Monday or match the calendar.3eCFR. 29 CFR Part 778 – Overtime Compensation
Two practical consequences follow. First, a schedule of four 10-hour days hits 40 hours with no federal overtime owed, even though each day ran well past eight hours. Second, weeks stand alone. Your employer cannot average two weeks together, paying you for 80 hours flat when one week was 50 and the next was 30.
Exempt Employees Don’t Get Overtime
Not every worker qualifies for overtime protection. The FLSA exempts employees in bona fide executive, administrative, or professional roles from both the minimum wage and overtime provisions.4Office of the Law Revision Counsel. 29 USC 213 – Exemptions If you fall into one of these categories, your employer has no federal obligation to pay you extra for long days or for weeks over 40 hours.
To be exempt, you generally must be paid on a salary basis and meet job-duty tests. The Department of Labor is currently enforcing the 2019 salary threshold of $684 per week, or $35,568 per year.5U.S. Department of Labor. Earnings Thresholds for the Executive, Administrative, and Professional Exemptions If you earn less than that on salary, you are likely non-exempt and entitled to overtime regardless of your job title. Some states set higher thresholds.
What Counts as Part of Your Workday
Your paid workday often differs from the total time you spend at the workplace. Federal regulations draw clear lines around which activities count as compensable hours.
Short Rest Breaks
Rest breaks of about 5 to 20 minutes are treated as paid work time. Federal regulations require employers to count them as hours worked.6eCFR. 29 CFR 785.18 – Rest Two 10-minute breaks during a shift stay fully on the clock. Federal law doesn’t require employers to offer these breaks, but when they do, the time is compensable.7U.S. Department of Labor. Breaks and Meal Periods
Meal Periods
Meal breaks of at least 30 minutes generally don’t count as hours worked, provided you are completely relieved of all duties during that time.8U.S. Department of Labor. Fact Sheet 22: Hours Worked Under the Fair Labor Standards Act (FLSA) “Completely” is the key word. Eating lunch at your desk while answering phones or watching equipment turns the break into compensable work time, because you weren’t fully relieved.
Waiting and On-Call Time
Whether waiting counts as paid time depends on who controls it. Federal guidance distinguishes between being “engaged to wait” and “waiting to be engaged.” A worker who must stay at a duty station until something happens, like a firefighter waiting for an alarm, is engaged to wait, and that time is paid. A worker free to leave who carries a pager is generally waiting to be engaged, which is not paid.8U.S. Department of Labor. Fact Sheet 22: Hours Worked Under the Fair Labor Standards Act (FLSA)
On-call time follows the same logic. Required presence on the premises is paid time. Being on call from home, free to use the time as you please, typically isn’t, unless the restrictions are heavy enough that you cannot effectively use the time for personal purposes.
When Your Workday Starts and Stops
The Portal-to-Portal Act defines the boundaries of a compensable workday. Paid time begins when you perform your first “principal activity,” meaning the core task your job requires, and ends after your last one.9Office of the Law Revision Counsel. 29 USC 254 – Relief From Liability Activities before or after those bookends, like commuting or walking from the parking lot to your workstation, are generally not compensable.
Tasks essential to your main job count as principal activities even when they come before your scheduled shift. If your job requires specialized protective gear, gearing up starts the clock. A meatpacking worker suiting up in required safety equipment is performing a principal activity, and everything from that point through gear removal at the end is part of the workday.
Regular commuting is excluded from paid time, no matter how long it takes.8U.S. Department of Labor. Fact Sheet 22: Hours Worked Under the Fair Labor Standards Act (FLSA) If your employer sends you from one worksite to another during the day, though, that travel between sites is typically paid.
States That Do Set Daily Overtime
A small number of states require premium pay after a set number of hours in a single day, going beyond the federal weekly rule. Where state and federal law differ, the standard that benefits the worker more applies.
- California: Overtime at one and one-half times the regular rate begins after 8 hours in a workday. Work beyond 12 hours in a single day triggers double-time pay. The seventh consecutive workday in a week also carries overtime for the first 8 hours and double time after that.10U.S. Department of Labor. State Minimum Wage Laws
- Alaska: Daily overtime applies after 8 hours at one and one-half times the regular rate. Employers with fewer than four employees are exempt from this daily requirement.10U.S. Department of Labor. State Minimum Wage Laws
- Nevada: Daily overtime applies to employees earning less than 1.5 times the state minimum wage. With the state minimum at $12.00 per hour, workers earning under $18.00 qualify for overtime after 8 hours in a day. Workers earning $18.00 or more are only subject to the weekly 40-hour trigger.10U.S. Department of Labor. State Minimum Wage Laws
Colorado and Oregon also have forms of daily overtime, with different triggers and thresholds. Several states additionally require at least one full day of rest, meaning 24 consecutive hours, within every seven-day period, effectively capping how many days in a row you can be scheduled. Rules vary, so your state labor agency’s website is the most reliable place to confirm what applies to you.
Daily Hour Limits for Minors
Adult workers face no federal daily cap, but the FLSA strictly limits work hours for those under 16. For 14- and 15-year-olds:11U.S. Department of Labor. Fact Sheet 43: Child Labor Provisions of the FLSA for Nonagricultural Occupations
- No more than 3 hours of work on a school day.
- No more than 8 hours on a non-school day.
- Work is permitted only between 7 a.m. and 7 p.m., extended to 9 p.m. from June 1 through Labor Day.
Workers aged 16 and 17 have far fewer federal restrictions. Federal law does not cap their daily or weekly hours, nor does it impose time-of-day rules. The main federal protection at this age is a ban on working in occupations the Secretary of Labor has declared hazardous. Many states impose tighter rules for 16- and 17-year-olds, including night-work curfews and maximum shift lengths.
Industry-Specific Daily Caps for Safety
Some industries are dangerous enough that federal agencies impose hard daily limits, overriding the general FLSA flexibility. These caps come from safety research, not wage policy.
Commercial Truck Drivers
The Federal Motor Carrier Safety Administration limits how long commercial property-carrying drivers can operate. After 10 consecutive hours off duty, a driver may drive for a maximum of 11 hours.12Federal Motor Carrier Safety Administration. Summary of Hours of Service Regulations All driving must fall within a 14-consecutive-hour window measured from the start of the duty period. Once 14 hours pass since coming on duty, driving must stop, regardless of how many hours of that window were spent behind the wheel.13eCFR. 49 CFR 395.3 – Maximum Driving Time for Property-Carrying Vehicles Drivers must also take at least a 30-minute break after 8 cumulative hours of driving.
Over a longer stretch, drivers are capped at 60 hours of on-duty time in 7 consecutive days, or 70 hours in 8 days for carriers operating daily. Adverse driving conditions, like unexpected weather, allow the 11-hour driving limit to be extended by up to 2 hours.
Airline Pilots
FAA regulations cap flight time for commercial airline pilots. For a standard one- or two-pilot crew, a pilot may fly no more than 8 hours within any 24-consecutive-hour period without a required rest interval. When scheduled beyond 8 hours, the pilot must receive an intervening rest period at least twice the length of the preceding flight time, and never less than 8 hours. No pilot may fly more than 32 hours in any 7 consecutive days or more than 1,000 hours in a 12-calendar-month period.14eCFR. 14 CFR Part 121 Subpart R – Flight Time Limitations: Flag Operations Larger crews permit longer operations, and mandatory rest periods follow duty in every configuration to prevent fatigue-related accidents.