Engine impeller change frequency

Changed my impeller yesterday. I also have the Cummins 6BTA 330 hp and changed over to the SMX pump a few years ago. Nice pump, definitely better built compared to the Sherwood (stock one). The old impeller had 2 years of use, and almost 500 hours on it. On close examination, the old impeller looked "almost new".

During the winter, I don't use the boat. I store the engine with a mixture of freshwater and "salt away" in the raw water system. The local dock water is shut off to prevent freezing, so if I want to keep the saltwater out of my system, no running of the engine during the winter down time. So, I "bump" the starter every month to move the impeller to prevent it taking a set. This seems to be working??
I think I probably could go 3 years if I removed the pump cover annually to visually inspect the impeller condition. However, being somewhat conservative, I think I will do the annual inspection and stick to the 2 year interval.
Richard C., how long do you think (hours) before the pump might need a rebuild or are you going to wait for a visual signal (like a leak)?

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