Is there a maximum length for NOTAM?
According to an FAA guide to creating NOTAMs (see pages 14 and 21), the "condition text", i.e. the body of the NOTAM...


  has a max length around 1200 alpha-numeric characters. If necessary,
  the system will allow a user to create up to ten parts with 1200
  characters each


But, that doesn't include other parts of the NOTAM, like location, date/time, graphical elements etc. I don't know if there's a limit (in kB?) for the complete NOTAM file or not; the document doesn't seem to mention anything about that. It also isn't clear from the FAA document if the ~12,000 characters is a format limitation/specification, or a tool limitation.