I've had mine since they came out & haven't noticed any decline in pop. My swing has done some changing but the results from the driver on a good strike still performs as advertised from day one


DM

There is no cycle limit. Either it cracks or it doesn't. Higher club head speeds and abuse might shorten the life span. There are other OEM's where the face may flatten and reduce the impact/ball speed transfer. The Titleist R&D feel this is less of a problem with their drivers.

In order to be in the top distance performance, faces have been thinned. As a result, cracking is more common than it used to be for every top distance driver regardless of vendor. The military grade titanium Titleist uses in part is to minimize failure.

Indefinitely if your strike is near center and you have a slow or moderate swing speed.

Unless your clubhead speed is above 120mph you wont have to worry about anything except neglect and abuse.