Good question, a lot of depending on how you take care of your equipment. The other thing is how old is your equipment and if it's been upgraded. The manufacturer are using a harder materials, so you could get more dives and longer time between servicing. But if you don't take care of your equipment then it will need serviced. Do you pull your nose protesters back when cleaning. After washing do you put the reg. Back on a tank and blow the air out. The other factor is storage, hanging up on a cool area away from bugs. You wouldn't believe how bad the regulators can be yet still work. Just shows how good the manufacturers did in their designs.