They will last a lifetime if you use an ICE engine the way it was designed, But we are talking shutting down at idle times, which increases your Wear Red lights etc. Mail trucks, and UPS trucks are proof that they do wear. The bigger the engine, the more wear. Just use your head when turning off, 10 seconds vs 3 mins sit time. I wouldn't shutdown at every red light. 3 to 4 times the normal Startups.
Things that also wear.
Ignition switch Fords
Key tumbler - Fords and Chevys are the worst some older toyotas you could just start with any key once worn.
Electrical system, Battery, Alt and wiring Excessive Wire Load
ECU's on off on cycling
Starter and Flywheel
Vehicles should include shutdowns at idle times without having a complete Hybrid system. In an ICE engine, but so far all designed to start once and idle at stops.
I've been in the field a long time and flywheel damage exists. An easy 1000 to 1500 dollar repair vs 100.00-400.00 for a new starter. This would include Replacing both if your flywheel does loose its teeth.
This is from my Experience and to say it will last a lifetime is inaccurate when you are restarting 2 to 3 times more over the life of a vehicle.
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