The general rule of thumb for helping people do periodic jobs reliably is to have the job be frequent enough you can't forget, on never have to do it. Too infre

The general rule of thumb for helping people do periodic jobs reliably is to have the job be frequent enough you can't forget, on never have to do it. Too infrequent, and you forget what to do. Too frequent, and you get sloppy. I think the application to the leap seconds/minutes/hours situation is obvious.