70-Hour / 8-Day Rolling Cycle & 34-Hour Restart Guide [2026]
Master the 70-hour/8-day rolling HOS cycle and 34-hour restart rules (49 CFR § 395.3). Learn how to calculate rolling recap hours, US vs. Canada cycles, and dispatch math.
- Under 49 CFR § 395.3(b), commercial drivers operating property-carrying vehicles for carriers operating 7 days a week may not drive after logging 70 hours on-duty in any 8 consecutive days.
- The 34-Hour Restart: Any unbroken period of at least 34 consecutive hours spent Off-Duty, in Sleeper Berth, or a combination completely resets the 70-hour clock back to zero.
- Running on Recaps: Drivers who average 8.75 on-duty hours per day can drive indefinitely without ever taking a 34-hour restart, gaining back their Day 1 hours every midnight on Day 9.
- US vs. Canada Differences: Canada operates under Cycle 1 (70 hours in 7 days with a 36-hour reset) or Cycle 2 (120 hours in 14 days with a 72-hour reset).
- Once you hit 70 hours, you may still perform non-driving on-duty tasks (loading, paperwork, vehicle maintenance); you are only legally prohibited from DRIVING on public highways.
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1. The 70-Hour / 8-Day Rule Explained
While the 11-hour driving rule and 14-hour on-duty window govern daily operations, the 70-Hour / 8-Day Rule (codified under 49 CFR § 395.3(b)(2)) governs a commercial motor carrier's weekly cumulative workload.
A driver may not drive a commercial motor vehicle after having been on-duty for 70 hours in any period of 8 consecutive days. (Carriers that do not operate every day of the week are subject to the 60-Hour / 7-Day rule).
Crucial Legal Nuance: Hitting 70 hours does not mean you cannot work! You can continue performing non-driving work (inventorying cargo, pre-trips, fueling, dispatch paperwork) indefinitely. You are strictly forbidden from placing the vehicle in gear to drive on a public roadway.
2. How Rolling Recap Hours Work (The 8-Day Moving Window)
The 70-hour clock is a rolling 8-day moving window, not a fixed calendar week. It does not reset on Sunday night unless you take a full restart.
At midnight at the end of Day 8, the hours you worked on Day 1 drop off the back of the window and are credited back to your available balance for Day 9. This reclaimed time is called your Recap Hours.
3. Running on Recaps vs. Taking a 34-Hour Restart
Commercial fleets utilize two contrasting operational strategies to manage the 70-hour clock:
Strategy 1: Running on Recaps
By pacing yourself to work an average of 8.75 total on-duty hours per day (70 hrs ÷ 8 days = 8.75 hrs), you gain back ~8.75 hours every midnight. You can run continuously 365 days a year without ever taking a 34-hour restart!
Best for: Dedicated regional runs and predictable daily schedules.
Strategy 2: Burn & Restart
Maxing out your daily 11-hour driving and 14-hour on-duty window allows you to run hard (13–14 hours daily). You exhaust your entire 70-hour clock in 5 to 5.5 days, then take a full 34-hour off-duty reset over the weekend.
Best for: Long-haul cross-country OTR dispatch and spot-market surges.
4. Step-by-Step 8-Day Recap Calculation Table
The worksheet below illustrates how recap hours are calculated over a standard rolling cycle:
| Day | Date | Hours Worked | 70-Hr Used Total | Hours Gained at Midnight | Available for Next Day |
|---|---|---|---|---|---|
| Day 1 | Oct 1 | 9.0 hrs | 9.0 hrs | — | 61.0 hrs |
| Day 2 | Oct 2 | 10.0 hrs | 19.0 hrs | — | 51.0 hrs |
| Day 3 | Oct 3 | 8.5 hrs | 27.5 hrs | — | 42.5 hrs |
| Day 4 | Oct 4 | 11.0 hrs | 38.5 hrs | — | 31.5 hrs |
| Day 5 | Oct 5 | 9.5 hrs | 48.0 hrs | — | 22.0 hrs |
| Day 6 | Oct 6 | 8.0 hrs | 56.0 hrs | — | 14.0 hrs |
| Day 7 | Oct 7 | 7.0 hrs | 63.0 hrs | — | 7.0 hrs |
| Day 8 | Oct 8 | 6.0 hrs | 69.0 hrs | — | 1.0 hr |
| Day 9 | Oct 9 | Paced run | Rolling | +9.0 hrs (from Day 1!) | 10.0 hrs Available! |
On Day 9, the driver starts with 1.0 remaining hour from the 70-hour bank plus the 9.0 hours reclaimed from Day 1, giving them exactly 10.0 legal driving/duty hours for Day 9.
5. The 34-Hour Restart: Rules & Best Practices
Under 49 CFR § 395.3(d), any period of 34 or more consecutive hours off-duty will completely restart your 70-hour clock:
- Unbroken Continuity: If you log 33 hours and 50 minutes off-duty and then move the truck 50 feet, the entire restart is ruined! The clock does not reset, and you remain at your previous 70-hour limit.
- Status Allowed: The 34 hours can be logged as Off-Duty, Sleeper Berth, or any combination of the two.
- No Restriction on Frequency: Previous controversial rules requiring two 1:00 AM–5:00 AM rest periods or limiting restarts to once per 168 hours were permanently repealed by Congress in 2017. You can take a 34-hour restart whenever your dispatch schedule permits.
6. US FMCSA vs. Canadian NSC Standard 9 Cycles
Carriers crossing the border must adapt to Canada's National Safety Code (NSC) Standard 9 cycles:
| Jurisdiction | Work Cycle Options | Mandatory Restart Duration | Daily Off-Duty Mandate |
|---|---|---|---|
| United States (FMCSA) | 70 hours in 8 days (or 60 hrs in 7 days) | 34 Consecutive Hours | 10 consecutive hours off-duty |
| Canada Cycle 1 (NSC 9) | 70 hours in 7 days | 36 Consecutive Hours | 10 hours off (8 consecutive + 2 in 30m blocks) |
| Canada Cycle 2 (NSC 9) | 120 hours in 14 days | 72 Consecutive Hours | 10 hours off daily |
⚠️ Cross-Border Warning: A 34-hour restart taken in the United States does NOT satisfy Canada's mandatory 36-hour Cycle 1 restart! When entering Canada, ensure you have a full 36-hour break logged to restart your Canadian clock.
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