In the airlines we do not necessarily have fixed overhaul times but rather overhaul on condition of parts. As i said before we had engines that could remain over 40.000 hours on the wing, flying shorthaul operation with a take off every 70 minutes, because they were looked after in daily operations. And that means largely flying them less stressed by using flexed/assumed temperature/derated thrust methods.
We have to do the calculation (and guess what, pilots do technical jobs as well, many of them started as certified mechanics) and the costs saved as well as the amount of maintenance required because of wear is several magnitudes lower than on engines that have to do a full rated thrust take off every single time.