I doubt that there is a typical life as there are too many variables. I used to have a tournament ski boat that had been in the family for ~ 20 years and still had its original steering cable. There are several things that will hasten the deterioration of the steering and control cables. 1) Bending too tight of a turn. Slow, gentle turns are best. Unfortunately, the helm station is off to one side and the steering cable exits pointed right at the hull so it has to make an immediate turn. If the shape of the dash, the side and the placement of the throttle lever made routing the steering cable more difficult then it could end up turning too sharp. 2) Water: The rudder end of the steering cable usually attaches fairly low in the boat. If the bilge is usually full of water the end of the cable could be submerged and water could migrate into the cable causing corrosion. 3) Jacket damage: I have seen situations where a fan belt rubbed against the cable, or the cable rested against the engine and just vibration caused the jacket to wear through. I have also seen cases where someone working on the boat managed to step on the cable where it passed between stringers and cause damage. Even a small break in the jacket will allow water to get inside and cause corrosion. If you can get to the rudder then replacing the cable generally isn't too difficult.
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