ACGME Duty-Hour Rules, Plainly Explained

If you schedule residents, you've almost certainly heard someone cite the "80-hour rule" as though it were the whole story. It's the headline, but the ACGME's Common Program Requirements (Clinical Experience and Education chapter) actually lay out thirteen distinct duty-hour provisions, and a few of them trip up schedulers more often than the 80-hour cap itself. This is a plain-language walk-through of each one, with the section number so you can find it in the source document.

The 80-hour weekly maximum (§6.20.)

Clinical and educational work hours can't exceed 80 per week, averaged over a rolling four-week period. Crucially, this includes in-house work, clinical work done from home, and all moonlighting, internal or external. The averaging window is what catches people off guard - a single 90-hour week is fine on its own as long as the surrounding weeks bring the four-week average back under 80.

Eight hours off between shifts (§6.21.) - a "should," not a "must"

Residents should have at least eight hours off between scheduled clinical and education periods. The wording matters: this is a Detail requirement, softer than a Core (mandatory) one. Programs are expected to schedule for it, and a resident may occasionally choose to stay later or return sooner for patient care. The 80-hour weekly average acts as the real backstop against a pattern of short turnarounds.

14 hours free after 24 hours of in-house call (§6.21.a.)

This one is a Core requirement: after completing 24 hours of in-house call, a resident must get at least 14 hours free of clinical work and education before returning. Unlike the eight-hour gap above, this is not optional - schedulers who build 24-hour call rotations need to build the following day's recovery time directly into the pattern, not treat it as a nice-to-have.

One day free in seven, averaged over four weeks (§6.21.b.)

Residents need a minimum of one day in seven completely free of clinical work and required education, averaged over four weeks - and at-home call can't be assigned on those free days. A "day off" means one continuous 24-hour period free of all clinical, administrative, and educational duties. Consecutive days off (the "golden weekend") are explicitly allowed, not discouraged, by this language.

The 24-hour continuous work cap, plus a 4-hour transition window (§6.22., §6.22.a.)

Continuous scheduled clinical work can't exceed 24 hours. On top of that, up to 4 additional hours may be used only for patient-safety-related activities - effective handoffs or education - and no new patients may be assigned during that window. The full 24+4-hour period still counts toward the 80-hour weekly average, so this isn't extra capacity, just a safety valve for finishing care transitions properly.

The voluntary remain-to-care exception (§6.23./6.23.a.)

In rare cases, after formally handing off all other responsibilities, a resident may voluntarily choose to stay for a single severely ill patient, to give a family humanistic attention, or to attend a unique educational event. This can never be coerced, and the extra hours still count toward the 80-hour cap. It isn't a checkable schedule parameter - it's a judgment call residents make in the moment.

The 88-hour exception - currently suspended (§6.24./6.24.a.)

A specialty Review Committee can, in principle, grant a rotation-specific exception of up to 10% above the 80-hour cap (a maximum of 88 hours) with DIO/GMEC approval. As of the interim revision effective February 9, 2026, enforcement of this exception is explicitly suspended pending a larger revision of the Common Program Requirements - programs shouldn't currently plan around it.

Moonlighting counts toward the limit, and PGY-1s can't do it at all (§6.25., §6.25.a., §6.25.b.)

All moonlighting - internal or external - counts toward the 80-hour weekly maximum; it's never additive. First-year residents aren't permitted to moonlight at all, in any form. If your program allows moonlighting for senior residents, it needs to show up in the same weekly-hours tally as everything else, not live in a separate, untracked system.

Night float has no universal consecutive-night cap (§6.26.)

In-house night float remains bound by the 80-hour rule and the one-day-in-seven requirement, but the Common Program Requirements don't themselves set a maximum number of consecutive weeks of night float - that's left to individual specialty Review Committees to further specify. Don't assume a single universal cap here; check your specialty's own program requirements.

In-house call no more than every third night (§6.27.)

This is the classic "q3" ceiling: residents can't be scheduled for in-house call more frequently than every third night, averaged over four weeks. It's a Core requirement, and it's the one most call-schedule generators need to encode as a hard rule rather than a soft preference.

At-home call has its own rules (§6.28./6.28.a.)

Time spent on patient-care activities during at-home call counts toward the 80-hour limit (reading and studying don't). At-home call isn't subject to the every-third-night cap that governs in-house call, but it must still respect the one-day-in-seven free requirement, and it can't be so frequent that it prevents reasonable rest or personal time.

Common questions

Are these rules the same as they used to be?

The underlying requirements are largely unchanged, but the section numbering is not. The 2025 reformat replaced the historical Roman-numeral "VI.F.x" numbering with the decimal system used above (e.g. "6.20."). If you're cross-referencing an older document, expect the numbers to differ even where the rule text matches.

Do these apply to my non-ACGME fellowship or hospital?

No. They apply specifically to ACGME-accredited residency and fellowship programs in the United States. Plenty of non-accredited programs and hospital departments voluntarily follow similar limits as good workforce practice, but they aren't bound by this specific document.