The 34-Hour Restart, Worked Step by Step

The weekly on-duty limit is the longest clock a driver runs, and the 34-hour restart is the tool that resets it all at once. The Federal Motor Carrier Safety Administration, or FMCSA, defines the weekly cap in its hours-of-service regulations at 49 CFR 395.3(b): you may not drive after 60 hours on duty in any 7 consecutive days, or 70 hours in any 8 consecutive days, depending on whether your carrier runs every day of the week. The restart, in 49 CFR 395.3(c), gives you a clean slate: end your period with 34 or more consecutive hours off duty and your rolling on-duty total starts again at zero. This guide works through a full week so you can see exactly when the reset takes effect and what it is worth.

Why the weekly limit needs a reset at all

The 60- and 70-hour limits are rolling, not weekly-calendar limits. Under the FMCSA rule they look backward across the last 7 or 8 days and add up every hour you spent on duty, driving or not. Because it rolls, the total only comes down gradually: each day, the on-duty hours from the oldest day in the window fall off and become available again. Drivers call that gradual return the recap. It works, but it is slow, and it can leave you with only a few hours available on a morning when you need a full day. The restart is the alternative to waiting on the recap.

A worked week on the 70-hour/8-day limit

Say you run under the 70-hour, 8-day schedule and you log heavy days early in the week:

By Saturday evening you are nearly out of hours. You could crawl into next week on the recap, getting Monday's 13 hours back only after Monday drops off the 8-day window, and so on, a few hours at a time. Or you can take a restart.

Taking the restart

Suppose you finish Saturday at 6:00 p.m. and go off duty. To use the restart under 49 CFR 395.3(c), you need 34 or more consecutive hours off duty. Starting at 6:00 p.m. Saturday, 34 hours later is 4:00 a.m. Monday. The moment that 34-hour block is complete, your rolling on-duty total resets to zero. Come Monday morning you have the full 70 hours available again, rather than the trickle the recap would have handed you. That is the trade the restart offers: 34 straight hours off in exchange for the entire weekly limit back at once.

Restart or recap: which is better?

Neither is always right. The restart is powerful when you have run your hours down hard and want a full clean week, because it returns everything at once. But it costs 34 unbroken hours off duty, which is a long time to be parked if you did not need all your hours back. The recap is better when you only need a modest number of hours to return, because it gives them back day by day without requiring a long shutdown. The right choice depends on the exact shape of your week: how front-loaded your hours are, and how many you need available on which day. The 70-hour/8-day recap calculator on the hub projects both paths side by side so you can compare them for your actual logs rather than guessing.

Details drivers get wrong

A few points cause confusion. First, the restart is optional. The FMCSA removed the earlier restrictions that once limited how often a restart could be used and required specific overnight periods, so the current rule in 49 CFR 395.3(c) is simply 34 consecutive hours off duty. Second, the 34 hours must be truly consecutive and entirely off duty or in the sleeper berth; a single on-duty minute in the middle breaks the block and you start the 34-hour count over. Third, the restart resets only the weekly 60- or 70-hour total. It does not do anything special for your daily 11-hour and 14-hour clocks that a normal 10-hour rest would not already do, since a 34-hour block obviously contains far more than 10 hours off.

Fitting the restart into your planning

The restart is a weekly-planning decision, so think about it before you run your hours to the floor, not after. If you can see mid-week that you will be short by the weekend, you can position a 34-hour block over a slow period and come back fresh. Our overview of the hours-of-service rules shows how the weekly limit relates to the daily clocks, and if you are also juggling daily detention, see the 14-hour window for how a single day can slip away.

A quick disclaimer

This article is a planning aid, not a compliance record. Your Electronic Logging Device and the current FMCSA regulations are the authoritative account of your on-duty hours and any restart. Exceptions can apply to your operation and the rules can change, so confirm the specifics with the FMCSA and with your carrier before relying on anything here. Start at the Trucker Clock Hub home page to reach the recap calculator and the other tools.