How Many Hours in a '34-Hour' Restart?

How Many Hours in a '34-Hour' Restart?

How many hours are there in a “34-hour” restart? This isn’t a trick question.

For truck drivers, planning a work week just got much harder. Before July 1, drivers could end their week, spend 34 hours off duty and start a new week. Under regulations that took effect July 1, however, they may have to wait much longer, depending on when they go off duty.

Download JOC's HOS Restart App to install the latest version of this clock on your smartphone or tablet.

The new hours of service rules require two back-to-back 1 a.m. to 5 a.m. periods within the 34-hour “restart” period. That means drivers must end their week within a 6-hour window between 7 p.m. and 1 a.m. if they want a true 34-hour restart.

This interactive 24-hour clock can help you determine how long a rest period must be before a driver can start a new 60- or 70-hour work week. Choose a time to go off-duty and click on the hour for the length of the break and the restart time.

The new rules will make it tougher for drivers to get back on the road after 34 hours of rest, which means less miles and money for truckers. Carriers will have a harder time scheduling drivers and efficiently routing trucks, costing them money.

Shippers with lean inventories and tight delivery windows will find their supply chains more vulnerable to disruption, and feel more pressure to pay higher rates. They are likely to turn more to brokers and logistics companies for capacity.

Contact William B. Cassidy at and follow him at

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Does this clock/app take into account the 168 hour rule?

Just the straight 34-hour restart at the end of a week, John. We'd have to do a weekly clock or HOS program to factor in the 168-hour restriction that in effect bars drivers from using a restart more than once in a week (prohibiting you from using a restart if your truck breaks down in the middle of the week, stranding you for two days, for example).