How often are turbine blades in jet engines replaced? How often are the turbines in the hot section of the jet engines replaced due to deteriorated TBC? or just how often are they replaced? lets say for CFM56-7
So this article, says that the average brand new CFM56-7 will go 18,000 cycles (i.e. flights) before its first shop visit.  You can't replace the turbine blade on-wing, only in the overhaul shop.  So we could say that the blades would last at least 18,000 flights, potentially longer.