There is no single answer, because the limit depends on the assignment, the jurisdiction and the payment rules that apply. Most locum tenens assignments last from a few days to a few months, and some run a year or longer. However, specific rules can cap the arrangement. In the United States, Medicare allows a locum tenens arrangement for up to 60 continuous days. In Canada, provincial licensing rules often set the limit, such as three months in British Columbia or six consecutive months in Nova Scotia.
If you have searched questions like “How long can a locum tenens work?” or “Is there a time limit on locum tenens?”, this guide explains the typical timelines, the rules that matter and how practices can plan.
What Is a Locum Tenens?
Locum tenens is Latin for “placeholder.” It describes a physician or other clinician who temporarily covers for a regular provider, for example during leave, illness, vacation or a vacancy. The locum works for a set period and then the regular provider returns or a permanent replacement is found. Practices can arrange locums directly or through an agency.
How Long Do Locum Tenens Assignments Usually Last?
Assignments vary widely. They can be as short as a single shift or a couple of weeks, or they can last several months or longer, depending on the needs of the facility. A weekend or holiday gap may need only a few shifts, while a long leave or a hard to fill vacancy may need coverage for six months to a year.
One agency guide notes that the average assignment is about three months. Another describes mid term locums as running from three to six months, and long term locums as six months to a year or more. One national data summary found that only about 27 percent of assignments last longer than 90 days, which suggests that short and mid length coverage is more common than semi permanent placements.
| Type of assignment | Typical length | Common use |
| Short term | A few shifts to about two months | Vacations, holidays, weekend coverage |
| Mid term | About three to six months | Parental leave, recruitment gaps |
| Long term | Six months to a year or more | Extended leave, chronic vacancies, remote sites |
Some extended contracts exceed a year, especially in hard to staff specialties or rural and remote areas. Government facilities may also arrange locums that last multiple years.
What Determines How Long a Locum Can Stay?
Several factors shape the length of a locum arrangement:
- The reason for coverage. A short vacation needs weeks, while a medical leave or vacancy may need months.
- Specialty and location. Hard to staff specialties and remote communities often need longer coverage.
- Licensing and credentialing. Regulators and hospitals may limit the length of temporary registration or privileges.
- Payment and billing rules. Insurers and public payers can set time limits on substitute arrangements.
- The locum’s availability. Many locums prefer a set end date that fits their schedule.
Rules That Limit Locum Length in the United States
In the United States, the best known limit comes from Medicare. A regular physician may bill for services furnished by a substitute physician under a fee for time compensation arrangement, formerly called locum tenens, only if the substitute does not provide services to Medicare patients over a continuous period longer than 60 days. The only exception covers a regular physician called to active duty in a reserve component of the armed forces.
A few details matter:
- The 60 days are calendar days, not workdays, and the clock runs whether or not patient care is provided on each day.
- Skipping days does not pause the clock.
- If the substitute stays longer than 60 days, the regular physician bills the first 60 days with the appropriate modifier, and the substitute must bill the remainder in their own name after being credentialed and enrolled.
- Locum arrangements apply when the regular physician is unavailable. They cannot be used to cover high volume, overbooking or practice expansion.
Other payers and hospitals have their own credentialing rules, so confirm requirements with each one before you extend an assignment.
Rules That Limit Locum Length in Canada
In Canada, physician licensing is provincial, so the limit often comes from the regulatory college. Examples include:
- British Columbia: A monthly locum licence allows a locum tenens of up to three months in the province. An annual locum licence is available for physicians who keep a permanent practice elsewhere and complete at least three locums of up to three months each per year.
- Nova Scotia: A temporary locum licence allows practice for up to six consecutive months, and it cannot be renewed each year.
- New Brunswick: A locum may work a full calendar year, but may not replace any one physician for more than 183 days cumulatively in a 12 month period, with exceptions considered in exceptional circumstances.
- Manitoba: Temporary locum registration is cancelled when the specified period ends, and the registrar approves the time interval.
Rules change, and each province has its own application steps, so check with the relevant college before you plan a long assignment. Complex licensing across provinces is also a barrier to rural coverage, which is one reason regulators have been looking at easier temporary licensing.
Can a Locum Assignment Be Extended or Become Permanent?
Yes, within the limits above. Many assignments are extended once the locum and the facility agree, and a good fit can lead to a permanent role. Some physicians return to the same site year after year through repeated assignments, so they can work in one place for a long time even though each contract is temporary. Where payment rules cap a single arrangement, practices often change how the work is structured, for example by credentialing the locum as a regular provider.
How Practices and Hospitals Can Plan Locum Coverage
Locums work best when they are part of a planned coverage strategy, not a last minute fix. Consider the following:
- Start credentialing and licensing early so the locum can begin on time.
- Match the assignment length to the actual need, and build in a review date.
- Track billing and licensing limits so a long assignment does not create compliance problems.
- Prepare a handover and orientation so locums can deliver continuity of care.
- Reduce dependence on locums by addressing the causes of turnover and burnout.
MDconsultants supports organizations with these decisions. Our health services delivery work helps teams design coverage models and patient pathways. Our organizational health and wellness support addresses burnout, which often drives staffing gaps. Founders planning new clinics can explore healthcare startup consulting to build sustainable staffing from the start.
Tips for Physicians Considering Locum Work
- Decide whether you want short coverage, mid term stability or long term placements.
- Confirm licensing, insurance and credentialing requirements for each location before you commit.
- Ask how extensions work and whether the end date is firm.
- Clarify who handles billing, accommodation and travel.
- Document patient encounters and hand back cases clearly at the end of each assignment.
If you want guidance on locum opportunities and career planning, join MDconsultants.
Frequently Asked Questions
How long can a locum tenens work?
Assignments range from a few shifts to a year or more. The typical assignment is around three months, subject to licensing and payer rules.
Is there a time limit on locum tenens?
Often yes. In the United States, Medicare limits a substitute arrangement to 60 continuous days. In Canada, provincial licences set their own limits, such as three months in British Columbia.
Can a locum tenens be extended?
Yes, if the facility, the locum and the applicable rules allow it. Some locums also transition to permanent roles.
Can a locum tenens replace a physician who has died?
Under Medicare rules, no. Locum arrangements apply only when the regular physician is alive and expected to return, because the regular physician’s billing identifiers are deactivated after death.
How should a practice choose the length of a locum assignment?
Match the length to the real coverage need, check licensing and payer limits, and plan a review point before the end date.
Conclusion
You can use a locum tenens for as long as the need, the licence and the payment rules allow. That may be a few shifts, a few months or a year or more, but limits such as the 60 day Medicare rule or provincial licence terms can shape the plan. Planning early, tracking the rules and building a sustainable staffing model protect both patients and practices.
If you lead a clinic, hospital or healthcare venture and want practical support, contact MDconsultants or visit MDconsultants to learn more.