Service periods for Accutron servicing >>>

Question about Accutron servicing , how often should you service your Accutron watch? On average? I have recently had one of mine serviced and had a battery change too, My watchmaker is good he doesn't charge a lot for his service and i am very happy knowing its been done. But what about the others guys? Should i send them off to be serviced too? Thanks for looking guys.