No federal law sets a maximum number of hours a nurse can legally work in a day. The Fair Labor Standards Act requires overtime pay past 40 hours in a workweek but places no ceiling on how long a single shift can run. About 17 states have stepped in with their own restrictions, mostly by banning mandatory overtime rather than capping shift length directly. So the honest answer to how many hours you can be required to work depends on your state, your facility, and whether you’ve already accepted the patient assignment.
Federal Law Regulates Pay, Not Shift Length
The FLSA is the primary federal law governing work hours, and on the question of daily limits it says nothing. A hospital can legally schedule a nurse for a 16-hour shift, or longer, without violating federal law, so long as overtime pay kicks in on time.1U.S. Department of Labor. Fact Sheet 17N – Nurses and the Part 541 Exemptions Under the Fair Labor Standards Act Registered nurses paid hourly are entitled to time-and-a-half beyond 40 hours in a workweek. Licensed practical nurses qualify too, because they don’t meet the “learned professional” exemption.
The distinction matters. The FLSA protects your paycheck. It does not protect your schedule. If you’re pulling back-to-back 12-hour shifts and getting overtime for every hour past 40, the federal government treats that as compliant. Whether those hours are safe to work is a separate question that falls to state law, professional standards, and your employer’s policies.
State Restrictions on Mandatory Overtime
Because federal law leaves the daily-hours question open, roughly 17 states have enacted laws restricting or banning mandatory overtime for nurses. The specifics vary. Some states cap the number of hours a nurse can be required to work within a 24-hour period. Others don’t limit shift length directly but prohibit employers from forcing nurses to stay past their scheduled shifts. A handful mandate minimum rest periods between shifts.
These laws share a few features. They apply to hospitals and often extend to nursing homes and outpatient surgical centers. They define mandatory overtime as hours an employer requires beyond a nurse’s regularly scheduled shift. And they carve out exceptions for genuine emergencies. Violations can bring fines or other penalties from the state labor department or health department.
If your state has no nurse-specific overtime restriction, your employer’s scheduling power is limited only by the FLSA’s overtime pay requirements and whatever your employment contract or collective bargaining agreement provides. State labor department websites are the most reliable place to check the current rule where you work.
The Emergency Exception
Even in states that ban mandatory overtime, the ban almost always contains an emergency exception. These exceptions typically allow an employer to require overtime when a declared federal, state, or county emergency is in effect, when an unforeseen event or patient surge exceeds the facility’s predictable staffing needs, or when a nurse is already in the middle of a surgery or medical procedure that can’t safely be interrupted.
This is where disputes most often arise. Employers sometimes stretch the definition of “unforeseen” to cover chronic understaffing, which is predictable and not the kind of crisis these laws were designed to address. If your facility regularly invokes the emergency exception to cover routine scheduling gaps, that pattern may not hold up under your state’s law. State labor agencies and courts have been willing to examine the line between a genuine emergency and a staffing management failure.
Refusing an Extra Shift Is Not Patient Abandonment
One of the biggest fears nurses have about declining overtime is being accused of patient abandonment and disciplined by the state board of nursing. Most state boards draw a clear line between the two.
Declining to pick up an additional shift or refusing to work past your scheduled hours is generally treated as an employment dispute between you and your employer. It is not abandonment. Abandonment involves accepting responsibility for patients and then leaving them without appropriate care or handoff. Walking away mid-shift without notifying anyone, leaving patients unsupervised, or failing to report to the incoming shift after you’ve accepted an assignment are the kinds of conduct boards treat as abandonment.
The key factor is whether you’ve accepted the patient assignment. If your shift ends and your employer asks you to stay, saying no before taking on new patients is a scheduling dispute. Saying yes, taking the assignment, and then leaving is where abandonment risk begins. State boards have generally made clear that they have no jurisdiction over employer-employee disputes about extra shifts, and that refusing those hours is not grounds for a professional misconduct finding.
What OSHA and the ANA Say About Safe Shift Length
Neither OSHA nor any federal agency sets a legal cap on nursing shift length, but both OSHA and the American Nurses Association publish guidance that carries weight in the industry.
OSHA treats a normal work shift as no more than 8 consecutive hours during the day, five days a week, with at least an 8-hour rest period afterward. The agency warns that shifts longer than 8 hours generally reduce productivity and alertness, and that extended shifts should not be maintained for more than a few days, especially when the work demands heavy physical or mental effort.2Occupational Safety and Health Administration. Extended/Unusual Work Shifts Guide This guidance is not a regulation, but OSHA’s general duty clause requires employers to keep workplaces free from recognized hazards that could cause serious harm. Fatigue from excessive hours fits that description.
The ANA goes further. Its position on nurse fatigue recommends limiting shifts to no more than 12 hours in a 24-hour period, including mandatory training and meetings, and at least 10 consecutive hours off duty between shifts. It urges that nurses not exceed 40 hours of professional nursing work in a seven-day period. On mandatory overtime, the ANA’s position is that employers should eliminate it as a staffing solution entirely. The ANA’s Code of Ethics states that nurses have no ethical obligation to sacrifice their own safety or health for the benefit of others and that fatigue-compromised care violates professional standards.3American Nurses Association. 2025 Code of Ethics for Nurses Provision 5.1
If You’re Pressured to Work Beyond Legal Limits
In states with mandatory overtime restrictions, nurses can refuse extra hours beyond their scheduled shift without legal consequence. Even in states without specific nurse protections, your employment contract or union agreement may provide the same right. Where these protections exist, they typically specify that declining overtime in good faith is not patient abandonment and cannot be used as grounds for termination.
The practical challenge is that staffing shortages create heavy pressure to say yes. Some employers classify overtime as “voluntary” while making clear through scheduling patterns or workplace culture that refusal carries informal consequences. If you’re in that situation, documentation matters. Save communications about scheduling, note when you were asked to stay and under what circumstances, and check your state’s specific protections. A pattern of informal retaliation is harder for an employer to defend when the nurse has a paper trail.
Retaliation for reporting hour violations also triggers whistleblower protections. Federal law prohibits adverse employment actions such as demotion, suspension, or poor performance reviews against employees who disclose violations of law or dangers to public safety.4U.S. Department of Health and Human Services Office of Inspector General. Whistleblower Protection Information Employers who penalize nurses for raising scheduling concerns tend to make their legal situation worse, not better. And on the pay side, the Department of Labor’s Wage and Hour Division can sue on behalf of affected employees to recover unpaid back wages plus an equal amount in liquidated damages.5U.S. Department of Labor. Fair Labor Standards Act Advisor – Enforcement Under the Fair Labor Standards Act
Federal law will not stop your employer from scheduling a long shift, but it will require overtime pay. State law may go further by prohibiting mandatory overtime altogether. Professional standards hold that working to the point of fatigue is a threat to every patient in your care, and refusing an unsafe additional shift, before you accept the assignment, is a right most state boards recognize.