How often should a home in a coastal town like Forster or Taree get a termite inspection?

Ive heard different advice, some say once every 23 years, others say yearly. Since coastal areas tend to be more humid and have a lot of timber homes, Im wondering whats realistic. For anyone living in places like Forster or Taree, how often do you actually get termite inspections done, and has it helped prevent major issues?