What is the service interval of Miyota 9015/9019/9039 movement? Are there user experience, data, or expectation on service interval of these movements?

Here is what I’m asking. To me, there are 3 different tiers of mechanical watches:

1. On the high end, there are watches that are worth to repair and services. This group are watches more than $1000 or $1500. After years of usage and when the movement needs servicing, watch itself cost more than the service cost, so it is…

Service Longevity of Miyota 9015/9019/9039 Movements