This type of clock will be able to keep time within 4 minutes per week.

You will need to do the final regulation once the clock is in its permanent location to achieve this accuracy.

To check the clock's accuracy, set the hands to the correct time, and then let the clock run at least 3 or 4 days.

The main factors causing variations in rate are temperature changes, and the lessening tension of the mainspring as it runs down.

Once the clock is regulated to keep good time, you will need to set the hands whenever the time is off by more than a few minutes - perhaps every week or two.