It will vary by cartridge and manufacturer, but at least 25-40 hours for most moving coils, some will be longer. I really don't have any experience with moving magnets, but I would guess about the same with them. What is breaking in, is mostly mechanical.
A cartridge can deteriorate if unused for very long periods of time, and again will vary from manufacturer and cartridge.
Hope this is of some help.
Mike
A cartridge can deteriorate if unused for very long periods of time, and again will vary from manufacturer and cartridge.
Hope this is of some help.
Mike