“Usage time” code problems on MacBook Air (M4)

When I started setting up the MacBook Air that my 9-year-old daughter received for her first communion, I found myself entangled in the presence of a code for "usage time" that I have never set. I don't know if it goes automatically from the "Family" option, but since I have never entered it personally, I don't know what it is and therefore I can neither unlock it nor change it.