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Message: <blockquote data-quote="thor447" data-source="post: 3823177" data-attributes="member: 24867">It totally depends on the watch.  OEM suggestions are anywhere from 3-10 years.  Modern synthetic lubricants do not break down nearly as quickly as older conventional (mostly animal based) lubricants.  This greatly extends the service life. In the real world, most people don't have their mechanical watch serviced until it stops keeping accurate time, myself included.  A full service using modern lubricants, you'd probably be good for at least 5-7 years before you'd be due again, and even then it'd probably still keep pretty good time.  Parts will begin to wear faster though, so doing service every 5-7 years keeps replacement part costs at a minimum.</blockquote>