As little use as it would probably see, might not be much of a concern.
I use them every day and have them calibrated once a year. They are seldom very far off. Seems the 3/4" drive and 1" drive ones are the worst. But I'm really rough on them too. They get dropped ocassionaly, banged into stuff, and see thousands of miles a year riding around in a utility box on a truck.
I imagine using them gently to torque barrel nuts and even building twenty or so a year probably wouldn't be much need for any calibration for many years.
Just my two cents.
I realize everyone has a different level of OCD about stuff.






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