Generally speaking, turbine engines are scheduled for maintenance based on
flight cycles rather than hours; one cycle means one startup, one takeoff, one cruise segment, one landing, one T/R cycle, and one shutdown. Rotating parts are certified for xxxx cycles, and hot sections see hardware deterioration as a function of cycles.
So you can see that whether the cruise segment is 14 minutes or 14 hours, it makes little difference in engine life.
