What is the typical life cycle of mid-range rear derailleurs assuming no accidents? More precisely, what's the average mileage after which it's better to replace it rather than doing tuning all the time?
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Derailleurs will last almost indefinitely. The jockey wheels will wear out in time (tens of thousands of km) but the rest of the mechanism shouldn't see significant wear.
My main road bike has campagnolo gran sport derailleurs. That was mid range when I bought it back in 1980. Probably over 100000 miles by now. I have replaced cables and jockey wheels a few times but it still shifts great.