about 8 years on mine with over 320 on the seat. Chain was like the day we installed it. You just have to know how to properly fit the chain to your Cam to crank spread. That is why they make special order sprockets in different sizes. A loose chain will just get looser from stretch. A tight chain will gull and wear faster. Guys that don't know how to do this . Just throw a power robbing gear drive on it.
I will never use a gear drive. If in the budget I would go to a belt because of less reciprocating weight and harmonics are lower then a chain. Aren't you the same guy that swears by a aluminum flywheel because of less weight you have to spin. If someone would say they use a lightened damper yours would be lead filled.
Like the guy above he used his for 4 years . You came back that yours is on for 10 years. If he would have said 10 years yours would be 15. Get real
"yellow fish with no teeth just lips"
I use a chain with these springs and never stretched a chain yet. I had a rollmaster now I went with a special order Cloyes. I am glad the PO is going with a chain. He used common sense.
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