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Personally I torque the head nuts very often on a new head installation until I am completely comfortable that they have settled in and are holding consistent torque.
You can not torque too many times. However you can torque too much. (too high)
No fun having a freshly installed head develop a leak and fill a cylinder after it cools down and sits overnight if a quick check with a torque wrench after driving it could have prevented it from happening.