I would think it’s going to be very long lived Frank. I think the 12v ones are less than the 4.5kw 24v version but not half, I can’t remember but aren’t they something like 3kw? Generally the higher the voltage the greater the ability to arc (all separating contacts will arc to some degree). Couple this with Chris’s inspection of a used 12v solenoid to find the contacts in excellent condition and I think yours should be fine.