I have a Rolex watch. “They” recommend you send it to the factory for cleaning and servicing every 5 or 6 years. HA (needless to say I haven’t sent my watch back. My car doesn’t even need that much servicing)!!! It’s $600 for servicing. If it is my shop rate I would think it’s close to 4 hours.
My Patek was supposed to cost $850 years ago. Never ever had it cleaned.