iwc DA VINCI AUTOMATIC 4523 Mode D'emploi page 22

How often should my watch be serviced?
The optimal service cycle for your IWC timepiece is
exclusive to your watch and unique lifestyle. The
necessary interval between services will be determined
by your individual wearing habits; frequency of wear,
your environment/s, and the intensity of physical activity
you engage in. Your fine mechanical timepiece is an
extension of yourself and will run well for as long and
smoothly as it is treated. Therefore, we simply
recommend you to continue wearing your watch for as
long as pleases you and to only entrust it for a service if
you notice a deviation from the regular performance,
function or timekeeping. It will then be our pleasure to
reinstate the premium performance with the
suitable service.
Effective from November 2009.
Technical specifications subject to change.