How much does it cost to overhaul a Rolex GMT?

Could you please elaborate on the approximate cost of a Rolex GMT overhaul? I understand that the Rolex GMT is a prestigious and intricate timepiece, requiring precision maintenance and repair. As a collector and enthusiast of fine watches, I'm curious to know what the average cost range is for a comprehensive overhaul, including parts replacement, if necessary, and labor costs. Could you provide a ballpark figure or any insight into what factors might influence the total cost? I appreciate your insight and expertise in this matter.