Alan, I'm still learning but the life of a turbine has a lot to do with how you treat it. Same as any recip (prop type engine). Typically the manufacturers suggest a teardown and inspection every 25 hours. This is normally an approved repair facility function. The most replaced items would be the bearings. You can imagine that turning at 100K + RPM the bearings have a finite life. Keep your fuel clean, use the recommended turbine oil and protect the compressor from foriegn objects by using an inlet screen (FOD screen). All this will prolong the life of your engine. Other than the bearings, the remainder of the engine should give you hundreds of hours of pleasure.